From: Andreas Eversberg <jolly@eversberg.eu>
Date: Sun, 1 Apr 2018 12:12:04 +0000 (+0200)
Subject: Add On screen display and help screen
X-Git-Url: http://git.eversberg.eu/gitweb.cgi?p=mercenary-reloaded.git;a=commitdiff_plain;h=e66f60eb3551df9ebb500706a99243b528f7701f

Add On screen display and help screen
---

diff --git a/.gitignore b/.gitignore
index e78ba40..3204ca3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -29,6 +29,7 @@ src/libsound/libsound.a
 src/libjoystick/libjoystick.a
 src/libkeyboard/libkeyboard.a
 src/libdisk/libdisk.a
+src/libtext/libtext.a
 src/mercenary/libmain.a
 src/mercenary/mercenary2
 src/mercenary/mercenary3
diff --git a/configure.ac b/configure.ac
index 656d293..a4306c0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -59,6 +59,7 @@ AC_OUTPUT(
     src/libkeyboard/Makefile
     src/libdisk/Makefile
     src/libsdl/Makefile
+    src/libtext/Makefile
     src/mercenary/Makefile
     src/Makefile
     Makefile)
diff --git a/src/Makefile.am b/src/Makefile.am
index 5fe9513..0cc6d81 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -7,7 +7,8 @@ SUBDIRS = \
 	libjoystick \
 	libkeyboard \
 	libdisk \
-	libsound
+	libsound \
+	libtext
 
 if HAVE_SDL2
 if HAVE_GLEW
diff --git a/src/libsdl/opengl.c b/src/libsdl/opengl.c
index e10ef5f..74fcfe3 100644
--- a/src/libsdl/opengl.c
+++ b/src/libsdl/opengl.c
@@ -26,13 +26,18 @@
 #include "opengl.h"
 #include <GL/glew.h>
 
+#define MAX_OSD 2
 static uint8_t *legacy_rgb = NULL;
 static uint8_t *benson_rgb = NULL;
+static uint8_t *osd_rgba[MAX_OSD] = { NULL, NULL };
 static GLuint legacy_name;
 static GLuint benson_name;
+static GLuint osd_name[MAX_OSD];
 static int screen_width, screen_height;
 static int image_width, image_height;
+static int osd_width[MAX_OSD], osd_height[MAX_OSD];
 static int texture_size;
+static int osd_size[MAX_OSD];
 
 /* alloc and init an image texture with size that is greater than the power of two */
 int init_opengl(int _image_width, int _image_height)
@@ -82,6 +87,42 @@ error:
 	return rc;
 }
 
+/* alloc and init an osd texture with size that is greater than the power of two */
+int init_osd(int num, int _osd_width, int _osd_height)
+{
+	int rc;
+
+	if (num < 0 || num >= MAX_OSD) {
+		print_error("given OSD number out of range");
+		rc = -ENOMEM;
+		goto error;
+	}
+
+	osd_width[num] = _osd_width;
+	osd_height[num] = _osd_height;
+
+	/* generate texture */
+	for (osd_size[num] = 1; osd_size[num] <= osd_width[num] || osd_size[num] <= osd_height[num]; osd_size[num] *= 2)
+		;
+	osd_rgba[num] = calloc(osd_size[num] * osd_size[num], 4);
+	if (!osd_rgba[num]) {
+		print_error("Failed to allocate texture\n");
+		rc = -ENOMEM;
+		goto error;
+	}
+	glPixelStorei(GL_UNPACK_ALIGNMENT, 1); /* bytes */
+	glGenTextures(1, &osd_name[num]);
+	glBindTexture(GL_TEXTURE_2D, osd_name[num]);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, osd_size[num], osd_size[num], 0, GL_RGBA, GL_UNSIGNED_BYTE, osd_rgba[num]);
+
+	return 0;
+
+error:
+	return rc;
+}
+
 /* set clip planes so that the image portion of the image texture is centered and pixels are rectengular */
 void resize_opengl(int _screen_width, int _screen_height)
 {
@@ -156,8 +197,8 @@ void opengl_blit_legacy(uint8_t *rgb, int filter)
 	double height = (double)image_height / (double)texture_size;
 
 	glEnable(GL_TEXTURE_2D);
-	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);  /* no modulation with color */
 	glBindTexture(GL_TEXTURE_2D, legacy_name);
+	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);  /* no modulation with color */
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, (filter) ? GL_LINEAR : GL_NEAREST);
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, (filter) ? GL_LINEAR : GL_NEAREST);
 	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, image_width, image_height, GL_RGB, GL_UNSIGNED_BYTE, rgb);
@@ -248,8 +289,8 @@ void opengl_blit_benson(uint8_t *rgb, int filter, int benson_at_line, double fov
 	/* render benson */
 	rgb += image_width * benson_at_line * 3;
 	glEnable(GL_TEXTURE_2D);
-	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);  /* no modulation with color */
 	glBindTexture(GL_TEXTURE_2D, benson_name);
+	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);  /* no modulation with color */
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, (filter) ? GL_LINEAR : GL_NEAREST);
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, (filter) ? GL_LINEAR : GL_NEAREST);
 	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, benson_at_line, image_width, image_height - benson_at_line, GL_RGB, GL_UNSIGNED_BYTE, rgb);
@@ -266,6 +307,72 @@ void opengl_blit_benson(uint8_t *rgb, int filter, int benson_at_line, double fov
 	glDisable(GL_TEXTURE_2D);
 }
 
+/* render osd texture */
+void opengl_blit_osd(int num, uint8_t *rgba, int filter, int benson_at_line, double fov, double benson_size, double scale_x, double scale_y, double offset_x, double offset_y)
+{
+	double texture_left = 0.0;
+	double texture_right = (double)osd_width[num] / (double)osd_size[num];
+	double texture_top = 0.0;
+	double texture_bottom = (double)osd_height[num] / (double)osd_size[num];
+	double benson_start_at_position;
+	double osd_left = 0.0;
+	double osd_right = 1.0;
+	double osd_top = 0.0;
+	double osd_bottom = 1.0;
+	double slope, range, center;
+	if (fov) {
+		osd_left = -1.0;
+		osd_right = 1.0;
+		benson_start_at_position = ((double)image_height - (double)benson_at_line) * benson_size;
+		osd_top = ((double)image_height - benson_start_at_position) / (double)image_width;
+		osd_bottom = -((double)image_height * 2.0 - ((double)image_height - benson_start_at_position)) / (double)image_width;
+		/* calculate field-of-view */
+		slope = tan(fov / 360 * M_PI);
+	}
+	range = (osd_right - osd_left) / 2.0;
+	center = (osd_right + osd_left) / 2.0;
+	osd_left = (osd_left - center) * scale_x + center + range * offset_x;
+	osd_right = (osd_right - center) * scale_x + center + range * offset_x;
+	range = (osd_bottom - osd_top) / 2.0;
+	center = (osd_bottom + osd_top) / 2.0;
+	osd_top = (osd_top - center) * scale_y + center + range * offset_y;
+	osd_bottom = (osd_bottom - center) * scale_y + center + range * offset_y;
+
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+	glEnable(GL_TEXTURE_2D);
+	glBindTexture(GL_TEXTURE_2D, osd_name[num]);
+	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);  /* no modulation with color */
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, (filter) ? GL_LINEAR : GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, (filter) ? GL_LINEAR : GL_NEAREST);
+	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, osd_width[num], osd_height[num], GL_RGBA, GL_UNSIGNED_BYTE, rgba);
+	glBegin(GL_QUADS);
+	if (fov) {
+		/* perspective viewport */
+		glTexCoord2f(texture_left, texture_bottom);
+		glVertex3f(100.0 * osd_left, 100.0 * osd_bottom, -100.0 / slope);
+		glTexCoord2f(texture_right, texture_bottom);
+		glVertex3f(100.0 * osd_right, 100.0 * osd_bottom, -100.0 / slope);
+		glTexCoord2f(texture_right, texture_top);
+		glVertex3f(100.0 * osd_right, 100.0 * osd_top, -100.0 / slope);
+		glTexCoord2f(texture_left, texture_top);
+		glVertex3f(100.0 * osd_left, 100.0 * osd_top, -100.0 / slope);
+	} else {
+		/* orthogonal viewport */
+		glTexCoord2f(texture_left, texture_top);
+		glVertex3f(osd_left, osd_top, 0.0);
+		glTexCoord2f(texture_right, texture_top);
+		glVertex3f(osd_right, osd_top, 0.0);
+		glTexCoord2f(texture_right, texture_bottom);
+		glVertex3f(osd_right, osd_bottom, 0.0);
+		glTexCoord2f(texture_left, texture_bottom);
+		glVertex3f(osd_left, osd_bottom, 0.0);
+	}
+	glEnd();
+	glDisable(GL_TEXTURE_2D);
+	glDisable(GL_BLEND);
+}
+
 /* set color and opacity */
 void opengl_render_color(double r, double g, double b, double a)
 {
@@ -338,6 +445,8 @@ void opengl_render_point(double x, double y, double z, double size)
 /* free image texture */
 void exit_opengl(void)
 {
+	int i;
+
 	if (legacy_rgb) {
 		free(legacy_rgb);
 		legacy_rgb = NULL;
@@ -346,5 +455,11 @@ void exit_opengl(void)
 		free(benson_rgb);
 		benson_rgb = NULL;
 	}
+	for (i = 0; i < MAX_OSD; i++) {
+		if (osd_rgba[i]) {
+			free(osd_rgba[i]);
+			osd_rgba[i] = NULL;
+		}
+	}
 }
 
diff --git a/src/libsdl/opengl.h b/src/libsdl/opengl.h
index 883c803..edfdc5f 100644
--- a/src/libsdl/opengl.h
+++ b/src/libsdl/opengl.h
@@ -1,5 +1,6 @@
 
 int init_opengl(int _image_width, int _image_height);
+int init_osd(int num, int _osd_width, int _osd_height);
 void resize_opengl(int _screen_width, int _screen_height);
 void opengl_copy_last(void);
 void opengl_clear(void);
@@ -7,6 +8,7 @@ void opengl_viewport_legacy(int top);
 void opengl_blit_legacy(uint8_t *rgb, int filter);
 void opengl_viewport_improved(int bottom, int benson_at_line, double fov, double benson_size);
 void opengl_blit_benson(uint8_t *rgb, int filter, int benson_at_line, double fov, double benson_size, int pixel_size);
+void opengl_blit_osd(int num, uint8_t *rgba, int filter, int benson_at_line, double fov, double benson_size, double scale_x, double scale_y, double offset_x, double offset_y);
 void opengl_render_color(double r, double g, double b, double a);
 void opengl_render_polygon(double *x, double *y, double *z, int count, int cull_face);
 void opengl_render_polygon_and_line(double *x, double *y, double *z, int count);
diff --git a/src/libtext/Makefile.am b/src/libtext/Makefile.am
new file mode 100644
index 0000000..528d3a5
--- /dev/null
+++ b/src/libtext/Makefile.am
@@ -0,0 +1,7 @@
+AM_CPPFLAGS = -Wall -Wextra -g $(all_includes)
+
+noinst_LIBRARIES = libtext.a
+
+libtext_a_SOURCES = \
+	text.c
+
diff --git a/src/libtext/text.c b/src/libtext/text.c
new file mode 100644
index 0000000..6af9f21
--- /dev/null
+++ b/src/libtext/text.c
@@ -0,0 +1,124 @@
+/* Text screens and OSD generator
+ *
+ * (C) 2018 by Andreas Eversberg <jolly@eversberg.eu>
+ * All Rights Reserved
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include "topaz.h"
+
+#define COLOR(c)	{ *rgba++ = palette_red[c]; *rgba++ = palette_green[c]; *rgba++ = palette_blue[c]; *rgba++ = palette_alpha[c]; }
+#define COLOR_BLUE	0
+#define COLOR_WHITE	1
+#define COLOR_BLACK	2
+#define COLOR_YELLOW	3
+#define COLOR_RED	4
+static uint8_t palette_red[5] = { 0x00, 0xff, 0x00, 0xff, 0xdd };
+static uint8_t palette_green[5] = { 0x55, 0xff, 0x00, 0x88, 0x22 };
+static uint8_t palette_blue[5] = { 0xaa, 0xff, 0x22, 0x00, 0x22 };
+static uint8_t palette_alpha[5] = { 0xff, 0xff, 0xff, 0xff, 0xff };
+
+uint8_t *text_alloc(int image_width, int image_height, uint8_t alpha)
+{
+	uint8_t *buffer, *rgba;
+	int x, y;
+
+	palette_alpha[COLOR_BLUE] = alpha;
+
+	buffer = calloc(image_width * image_height, 4);
+	if (!buffer)
+		return NULL;
+
+	/* clear screen */
+	rgba = buffer;
+	for (y = 0; y < image_height; y++) {
+		for (x = 0; x < image_width; x++)
+			COLOR(COLOR_BLUE)
+	}
+
+	return buffer;
+}
+
+/* render given text to an RGBA image */
+void text_render(uint8_t *buffer, int image_width, int image_height, const char *text, uint8_t alpha, int color, double start_column, double start_line, int double_height)
+{
+	uint8_t	*rgba;
+	char *font;
+	int x, y, i, j;
+
+	palette_alpha[COLOR_BLUE] = alpha;
+
+	x = start_column * 8.0;
+	y = start_line * ((double_height) ? 16.0 : 8.0);
+	if (x < 0 || y < 0)
+		return;
+
+	/* render text */
+	while (*text) {
+		/* newline */
+		if (*text == '\n') {
+			y += (double_height) ? 16 : 8;
+			x = start_column * 8.0;
+			text++;
+			continue;
+		}
+		/* if no space to the bottom */
+		if (y + ((double_height) ? 16 : 8) > image_height)
+			break;
+		/* if no space to the right */
+		if (x + 8 > image_width) {
+			text++;
+			continue;
+		}
+		/* if non visible characters */
+		if (*text < 32 || *text > 126) {
+			text++;
+			continue;
+		}
+		/* set pointers */
+		rgba = buffer + (y * image_width + x) * 4;
+		font = topaz_data + (*text - 32) * 64 + 7;
+		for (i = 0; i < 8; i++) {
+			/* render one line */
+			for (j = 0; j < 8; j++) {
+				if (*font)
+					COLOR(color)
+				else
+					COLOR(COLOR_BLUE)
+				font += 8;
+			}
+			if (double_height) {
+				font -= 64;
+				rgba += (image_width - 8) * 4;
+				/* render line again */
+				for (j = 0; j < 8; j++) {
+					if (*font)
+						COLOR(color)
+					else
+						COLOR(COLOR_BLUE)
+					font += 8;
+				}
+			}
+			rgba += (image_width - 8) * 4;
+			font -= 65;
+		}
+		x += 8;
+		text++;
+	}
+}
+
diff --git a/src/libtext/text.h b/src/libtext/text.h
new file mode 100644
index 0000000..f3be18e
--- /dev/null
+++ b/src/libtext/text.h
@@ -0,0 +1,4 @@
+
+uint8_t *text_alloc(int image_width, int image_height, uint8_t alpha);
+void text_render(uint8_t *buffer, int image_width, int image_height, const char *text, uint8_t alpha, int color, double start_column, double start_line, int double_height);
+
diff --git a/src/libtext/topaz.h b/src/libtext/topaz.h
new file mode 100644
index 0000000..ff92ce8
--- /dev/null
+++ b/src/libtext/topaz.h
@@ -0,0 +1,770 @@
+static char topaz_data[] = {
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,1,1,0,
+	0,1,0,1,1,1,1,1,
+	0,1,0,1,1,1,1,1,
+	0,0,0,0,0,1,1,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,1,1,
+	0,0,0,0,0,0,1,1,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,1,1,
+	0,0,0,0,0,0,1,1,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,1,0,1,0,0,
+	0,1,1,1,1,1,1,1,
+	0,1,1,1,1,1,1,1,
+	0,0,0,1,0,1,0,0,
+	0,1,1,1,1,1,1,1,
+	0,1,1,1,1,1,1,1,
+	0,0,0,1,0,1,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,1,0,0,1,0,0,
+	0,0,1,0,1,1,1,0,
+	0,1,1,0,1,0,1,1,
+	0,1,1,0,1,0,1,1,
+	0,0,1,1,1,0,1,0,
+	0,0,0,1,0,0,1,0,
+	0,0,0,0,0,0,0,0,
+	1,1,0,0,0,1,1,0,
+	0,1,1,0,0,1,1,0,
+	0,0,1,1,0,0,0,0,
+	0,0,0,1,1,0,0,0,
+	0,0,0,0,1,1,0,0,
+	0,1,1,0,0,1,1,0,
+	0,1,1,0,0,0,1,1,
+	0,0,0,0,0,0,0,1,
+	0,0,1,1,0,0,0,0,
+	0,1,1,1,1,1,1,0,
+	0,1,0,0,1,1,1,1,
+	0,1,0,1,1,0,0,1,
+	0,0,1,1,0,1,1,1,
+	0,1,1,1,1,0,1,0,
+	0,1,0,0,1,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,1,0,0,
+	0,0,0,0,0,1,1,1,
+	0,0,0,0,0,0,1,1,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,1,1,1,0,0,
+	0,0,1,1,1,1,1,0,
+	0,1,1,0,0,0,1,1,
+	0,1,0,0,0,0,0,1,
+	0,1,0,0,0,0,0,1,
+	0,1,0,0,0,0,0,1,
+	0,1,0,0,0,0,0,1,
+	0,1,1,0,0,0,1,1,
+	0,0,1,1,1,1,1,0,
+	0,0,0,1,1,1,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,1,0,0,0,
+	0,0,1,0,1,0,1,0,
+	0,0,1,1,1,1,1,0,
+	0,0,0,1,1,1,0,0,
+	0,0,0,1,1,1,0,0,
+	0,0,1,1,1,1,1,0,
+	0,0,1,0,1,0,1,0,
+	0,0,0,0,1,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,1,0,0,0,
+	0,0,0,0,1,0,0,0,
+	0,0,1,1,1,1,1,0,
+	0,0,1,1,1,1,1,0,
+	0,0,0,0,1,0,0,0,
+	0,0,0,0,1,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	1,0,0,0,0,0,0,0,
+	1,1,1,0,0,0,0,0,
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+	1,0,0,0,0,0,0,0,
+	1,0,0,0,0,0,0,0,
+	1,0,0,0,0,0,0,0,
+	1,0,0,0,0,0,0,0,
+	1,0,0,0,0,0,0,0,
+	1,0,0,0,0,0,0,0,
+	1,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,1,1,
+	0,0,0,0,0,1,1,1,
+	0,0,0,0,0,1,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,1,0,0,0,0,0,
+	0,1,1,0,0,1,0,0,
+	0,1,0,1,0,1,0,0,
+	0,1,0,1,0,1,0,0,
+	0,0,1,1,1,1,0,0,
+	0,1,1,1,1,0,0,0,
+	0,1,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,1,
+	0,0,1,1,1,1,1,1,
+	0,1,1,1,1,1,1,1,
+	0,1,0,0,1,0,0,0,
+	0,1,0,0,0,1,0,0,
+	0,1,1,1,1,1,0,0,
+	0,0,1,1,1,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,1,1,1,0,0,0,
+	0,1,1,1,1,1,0,0,
+	0,1,0,0,0,1,0,0,
+	0,1,0,0,0,1,0,0,
+	0,1,1,0,1,1,0,0,
+	0,0,1,0,1,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,1,1,1,0,0,0,
+	0,1,1,1,1,1,0,0,
+	0,1,0,0,0,1,0,0,
+	0,1,0,0,1,0,0,1,
+	0,0,1,1,1,1,1,1,
+	0,1,1,1,1,1,1,1,
+	0,1,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,1,1,1,0,0,0,
+	0,1,1,1,1,1,0,0,
+	0,1,0,1,0,1,0,0,
+	0,1,0,1,0,1,0,0,
+	0,1,0,1,1,1,0,0,
+	0,0,0,1,1,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,1,0,0,1,0,0,0,
+	0,1,1,1,1,1,1,0,
+	0,1,1,1,1,1,1,1,
+	0,1,0,0,1,0,0,1,
+	0,0,0,0,0,0,1,1,
+	0,0,0,0,0,0,1,0,
+	0,0,0,0,0,0,0,0,
+	0,1,0,0,0,0,0,0,
+	1,1,0,1,1,0,0,0,
+	1,0,1,1,1,1,0,0,
+	1,0,1,0,0,1,0,0,
+	1,0,1,0,0,1,0,0,
+	1,1,1,1,1,0,0,0,
+	0,1,0,1,1,1,0,0,
+	0,0,0,0,0,1,0,0,
+	0,1,0,0,0,0,0,1,
+	0,1,1,1,1,1,1,1,
+	0,1,1,1,1,1,1,1,
+	0,0,0,0,1,0,0,0,
+	0,0,0,0,0,1,0,0,
+	0,1,1,1,1,1,0,0,
+	0,1,1,1,1,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,1,0,0,0,1,0,0,
+	0,1,1,1,1,1,0,1,
+	0,1,1,1,1,1,0,1,
+	0,1,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,1,0,0,0,0,0,0,
+	1,1,0,0,0,0,0,0,
+	1,0,0,0,0,0,0,0,
+	1,0,0,0,0,0,0,0,
+	1,1,1,1,1,1,0,1,
+	0,1,1,1,1,1,0,1,
+	0,0,0,0,0,0,0,0,
+	0,1,0,0,0,0,0,1,
+	0,1,1,1,1,1,1,1,
+	0,1,1,1,1,1,1,1,
+	0,0,0,1,0,0,0,0,
+	0,0,1,1,1,0,0,0,
+	0,1,1,0,1,1,0,0,
+	0,1,0,0,0,1,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,1,0,0,0,0,0,1,
+	0,1,1,1,1,1,1,1,
+	0,1,1,1,1,1,1,1,
+	0,1,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,1,1,1,1,1,0,0,
+	0,1,1,1,1,1,0,0,
+	0,0,0,0,1,0,0,0,
+	0,0,0,1,0,0,0,0,
+	0,0,0,0,1,1,0,0,
+	0,1,1,1,1,1,0,0,
+	0,1,1,1,1,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,1,1,1,1,1,0,0,
+	0,1,1,1,1,1,0,0,
+	0,0,0,0,0,1,0,0,
+	0,0,0,0,0,1,0,0,
+	0,1,1,1,1,1,0,0,
+	0,1,1,1,1,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,1,1,1,0,0,0,
+	0,1,1,1,1,1,0,0,
+	0,1,0,0,0,1,0,0,
+	0,1,0,0,0,1,0,0,
+	0,1,1,1,1,1,0,0,
+	0,0,1,1,1,0,0,0,
+	0,0,0,0,0,0,0,0,
+	1,0,0,0,0,1,0,0,
+	1,1,1,1,1,1,0,0,
+	1,1,1,1,1,0,0,0,
+	1,0,1,0,0,1,0,0,
+	0,0,1,0,0,1,0,0,
+	0,0,1,1,1,1,0,0,
+	0,0,0,1,1,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,1,1,0,0,0,
+	0,0,1,1,1,1,0,0,
+	0,0,1,0,0,1,0,0,
+	0,0,1,0,0,1,0,0,
+	1,1,1,1,1,1,0,0,
+	1,1,1,1,1,0,0,0,
+	1,0,0,0,0,1,0,0,
+	0,1,0,0,0,1,0,0,
+	0,1,1,1,1,1,0,0,
+	0,1,1,1,1,1,0,0,
+	0,1,0,0,1,0,0,0,
+	0,0,0,0,0,1,0,0,
+	0,0,0,1,1,1,0,0,
+	0,0,0,1,1,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,1,0,0,1,0,0,0,
+	0,1,0,1,1,1,0,0,
+	0,1,0,1,0,1,0,0,
+	0,1,0,1,0,1,0,0,
+	0,1,1,1,0,1,0,0,
+	0,0,1,0,0,1,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,1,0,0,
+	0,0,1,1,1,1,1,0,
+	0,1,1,1,1,1,1,1,
+	0,1,0,0,0,1,0,0,
+	0,0,1,0,0,1,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,1,1,1,1,0,0,
+	0,1,1,1,1,1,0,0,
+	0,1,0,0,0,0,0,0,
+	0,1,0,0,0,0,0,0,
+	0,0,1,1,1,1,0,0,
+	0,1,1,1,1,1,0,0,
+	0,1,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,1,1,1,0,0,
+	0,0,1,1,1,1,0,0,
+	0,1,1,0,0,0,0,0,
+	0,1,1,0,0,0,0,0,
+	0,0,1,1,1,1,0,0,
+	0,0,0,1,1,1,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,1,1,1,0,0,
+	0,1,1,1,1,1,0,0,
+	0,1,1,0,0,0,0,0,
+	0,0,0,1,1,0,0,0,
+	0,1,1,0,0,0,0,0,
+	0,1,1,1,1,1,0,0,
+	0,0,0,1,1,1,0,0,
+	0,0,0,0,0,0,0,0,
+	0,1,0,0,0,1,0,0,
+	0,1,1,0,1,1,0,0,
+	0,0,1,1,1,0,0,0,
+	0,0,0,1,0,0,0,0,
+	0,0,1,1,1,0,0,0,
+	0,1,1,0,1,1,0,0,
+	0,1,0,0,0,1,0,0,
+	0,0,0,0,0,0,0,0,
+	1,0,0,1,1,1,0,0,
+	1,0,1,1,1,1,0,0,
+	1,1,1,0,0,0,0,0,
+	0,1,1,0,0,0,0,0,
+	0,0,1,1,1,1,0,0,
+	0,0,0,1,1,1,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,1,0,0,1,1,0,0,
+	0,1,1,0,0,1,0,0,
+	0,1,1,1,0,1,0,0,
+	0,1,0,1,1,1,0,0,
+	0,1,0,0,1,1,0,0,
+	0,1,1,0,0,1,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,1,0,0,0,
+	0,0,0,0,1,0,0,0,
+	0,0,1,1,1,1,1,0,
+	0,1,1,1,0,1,1,1,
+	0,1,0,0,0,0,0,1,
+	0,1,0,0,0,0,0,1,
+	0,1,0,0,0,0,1,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	1,1,1,1,1,1,1,1,
+	1,1,1,1,1,1,1,1,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,1,0,0,0,0,1,0,
+	0,1,0,0,0,0,0,1,
+	0,1,0,0,0,0,0,1,
+	0,1,1,1,0,1,1,1,
+	0,0,1,1,1,1,1,0,
+	0,0,0,0,1,0,0,0,
+	0,0,0,0,1,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,1,0,
+	0,0,0,0,0,0,0,1,
+	0,0,0,0,0,0,0,1,
+	0,0,0,0,0,0,1,1,
+	0,0,0,0,0,0,1,0,
+	0,0,0,0,0,0,1,0,
+	0,0,0,0,0,0,0,1,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0,
+	0,0,0,0,0,0,0,0
+};
diff --git a/src/libvideo/video.c b/src/libvideo/video.c
index c48742f..b0cf223 100644
--- a/src/libvideo/video.c
+++ b/src/libvideo/video.c
@@ -27,6 +27,7 @@
 
 static void planar2chunky(uint8_t *rgb, uint8_t *bitplanes[], uint16_t palette[], int planes, int width, int y_start, int y_end)
 {
+	uint8_t red, green, blue;
 	int x, y, p, b, i;
 	uint8_t word[planes], chunk;
 	uint16_t rgb4;
@@ -46,9 +47,15 @@ static void planar2chunky(uint8_t *rgb, uint8_t *bitplanes[], uint16_t palette[]
 					word[p] <<= 1;
 				}
 				rgb4 = palette[chunk];
-				*rgb++ = (rgb4 >> 4) & 0xf0;
-				*rgb++ = rgb4 & 0xf0;
-				*rgb++ = rgb4 << 4;
+				red = (rgb4 >> 4) & 0xf0;
+				green = rgb4 & 0xf0;
+				blue = rgb4 << 4;
+				red = red | (red >> 4);
+				green = green | (green >> 4);
+				blue = blue | (blue >> 4);
+				*rgb++ = red;
+				*rgb++ = green;
+				*rgb++ = blue;
 			}
 			i++;
 		}
@@ -83,6 +90,9 @@ static void planar2chunky2(uint8_t *rgb1, uint8_t *bitplanes[], uint16_t palette
 				red = (rgb4 >> 4) & 0xf0;
 				green = rgb4 & 0xf0;
 				blue = rgb4 << 4;
+				red = red | (red >> 4);
+				green = green | (green >> 4);
+				blue = blue | (blue >> 4);
 				*rgb1++ = red;
 				*rgb1++ = green;
 				*rgb1++ = blue;
diff --git a/src/mercenary/Makefile.am b/src/mercenary/Makefile.am
index 621b34c..be50a95 100644
--- a/src/mercenary/Makefile.am
+++ b/src/mercenary/Makefile.am
@@ -21,6 +21,7 @@ mercenary2_LDADD = \
 	$(top_builddir)/src/libcpu/libcpu.a \
 	$(top_builddir)/src/libframerate/libframerate.a \
 	$(top_builddir)/src/libvideo/libvideo.a \
+	$(top_builddir)/src/libtext/libtext.a \
 	$(top_builddir)/src/libsound/libsound.a \
 	$(top_builddir)/src/libjoystick/libjoystick.a \
 	$(top_builddir)/src/libdisk/libdisk.a \
@@ -39,6 +40,7 @@ mercenary3_LDADD = \
 	$(top_builddir)/src/libcpu/libcpu.a \
 	$(top_builddir)/src/libframerate/libframerate.a \
 	$(top_builddir)/src/libvideo/libvideo.a \
+	$(top_builddir)/src/libtext/libtext.a \
 	$(top_builddir)/src/libsound/libsound.a \
 	$(top_builddir)/src/libjoystick/libjoystick.a \
 	$(top_builddir)/src/libdisk/libdisk.a \
diff --git a/src/mercenary/main.c b/src/mercenary/main.c
index cda13e1..866d795 100644
--- a/src/mercenary/main.c
+++ b/src/mercenary/main.c
@@ -33,6 +33,7 @@
 #include "../libjoystick/joystick.h"
 #include "../libkeyboard/keyboard.h"
 #include "../libdisk/disk.h"
+#include "../libtext/text.h"
 #include "mercenary.h"
 #include "render.h"
 
@@ -81,12 +82,19 @@ static int config_improve_extend_roads = 1;	/* set to 1 to extend roads */
 static uint8_t *memory = NULL;
 static uint8_t *stop_event = NULL;
 static uint8_t *image = NULL;
+static uint8_t *help_osd = NULL;
+static uint8_t *info_osd = NULL;
+static int help_view = 1;
+static int32_t osd_timer = 0;
 #define SCREEN_WIDTH	320
 #define SCREEN_HEIGHT	200
 #define IMAGE_WIDTH	320
 #define IMAGE_HEIGHT	200
 #define BENSON_AT_LINE	136
 #define IMAGE_DIWSTART	0x2c
+#define HELP_ALPHA	0xd0
+#define OSD_WIDTH	320
+#define OSD_HEIGHT	16
 static uint16_t *chipreg = NULL;
 static stereo_t *sound_buffer = NULL; /* sound buffer memory */
 static int sound_buffer_size; /* buffer sample size */
@@ -304,9 +312,12 @@ static void main_loop(void)
 		/* amgia speed: don't render if we still delay */
 		/* non amiga speed: render if we need a new frame */
 		/* NOTE: at input event we must render after every VBL, so we do this in every loop */
-		if ((frame_render && !config_amiga_speed)
-		 || (config_amiga_speed && render_delay <= 0.0)
-		 || event == STOP_AT_WAIT_INPUT) {
+		/* in case of help view: stop cpu after first IRQ, regardless of other options */
+		/* NOTE: We need initial IRQ, so we have out copper list initialized */
+		if (((frame_render && !config_amiga_speed)
+		  || (config_amiga_speed && render_delay <= 0.0)
+		  || event == STOP_AT_WAIT_INPUT)
+		&& !(had_first_irq && help_view)) {
 			frame_render = 0;
 			/* start capturing for improved graphics */
 			if (render_improved)
@@ -333,12 +344,14 @@ static void main_loop(void)
 		/* render improved graphics, interpolate, if required */
 		if (render_improved)
 			render_all_items((config_amiga_speed) ? 1.0 : frame_time);
-		/* advance frame time */
-printf("frame rate: %.6f, frame-step=%.5f frame-time=%.5f\n", 1.0 / vbl_duration, frame_step,frame_time);
-		frame_time += frame_step;
-		if (frame_time >= 1.0) {
-			frame_time -= 1.0;
-			frame_render = 1;
+		/* advance frame time, if we are not in help view  */
+		if (!(had_first_irq && help_view)) {
+//printf("frame rate: %.6f, frame-step=%.5f frame-time=%.5f\n", 1.0 / vbl_duration, frame_step,frame_time);
+			frame_time += frame_step;
+			if (frame_time >= 1.0) {
+				frame_time -= 1.0;
+				frame_render = 1;
+			}
 		}
 
 		/* STEP 2: transfer legacy image (or just benson) in memory to OpenGL texture */
@@ -349,70 +362,90 @@ printf("frame rate: %.6f, frame-step=%.5f frame-time=%.5f\n", 1.0 / vbl_duration
 			if (render_legacy)
 				emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, 0, BENSON_AT_LINE, double_pixel_size);
 		}
-		/* render benson on improved rendering, if enabled */
-		if (render_improved)
+		/* render benson + osd ontop of improved opengl rendering, if enabled */
+		if (render_improved) {
 			opengl_blit_benson(image, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size, (double_pixel_size) ? 2 : 1);
+			if (help_view)
+				opengl_blit_osd(0, help_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size, 1.0, 1.0, 0.0, 0.0);
+			if (osd_timer) {
+				opengl_blit_osd(1, info_osd, config_video_filter, (double_pixel_size) ? BENSON_AT_LINE * 2 : BENSON_AT_LINE, config_fov, benson_size, 0.5, 0.04, 0.5, -0.95);
+				if (osd_timer - (int32_t)SDL_GetTicks() < 0)
+					osd_timer = 0;
+			}
+		}
 		/* setup viewport for legacy image and render image, if enabled */
 		if (render_legacy) {
 			opengl_viewport_legacy(debug_opengl);
 			opengl_blit_legacy(image, config_video_filter);
+			if (help_view)
+				opengl_blit_osd(0, help_osd, config_video_filter, 0, 0.0, 0, 1.0, 1.0, 0.0, 0.0);
+			if (osd_timer) {
+				opengl_blit_osd(1, info_osd, config_video_filter, 0, 0.0, 0, 0.5, 0.04, 0.5, -0.95);
+				if (osd_timer - (int32_t)SDL_GetTicks() < 0)
+					osd_timer = 0;
+			}
 		}
-		/* wait for VBL and show */
+
+		/* at this point we are ready with our image, so we display */
 		swap_sdl();
 		/* measure frame rate */
 		framerate_measure();
 
 		/* STEP 3: execute interrupt at rate of 50Hz, render sound */
-		current_time = SDL_GetTicks();
-		diff = current_time - last_time;
-		/* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
-		if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
-			diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
-			last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
-		}
-		while (diff > 1000 / IRQ_RATE) {
-			execute_cpu(3, NULL);
-			execute_cpu(4, NULL);
-			had_first_irq = 1;
-			/* transfer benson without game view
-			 * because we only got benson refreshed during VBL IRQ
-			 */
-			emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
-			/* render sound to sound buffer
-			 * buffer pointer read and write is atomic, so no locking required!
-			 */
-			space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
-			if (space < SOUND_SAMPLERATE / IRQ_RATE) {
+		/* only do this, if we are not in help view */
+		/* NOTE: We need initial IRQ, so we have out copper list initialized */
+		if (!(had_first_irq && help_view)) {
+			current_time = SDL_GetTicks();
+			diff = current_time - last_time;
+			/* in case of timer glitch, execute IRQ only by maximum number of SOUND_CHUNKS */
+			if (diff > 1000 * SOUND_CHUNKS / IRQ_RATE) {
+				diff = 1000 * SOUND_CHUNKS / IRQ_RATE;
+				last_time = current_time - 1000 * SOUND_CHUNKS / IRQ_RATE;
+			}
+			while (diff > 1000 / IRQ_RATE) {
+				execute_cpu(3, NULL);
+				execute_cpu(4, NULL);
+				had_first_irq = 1;
+				/* transfer benson without game view
+				 * because we only got benson refreshed during VBL IRQ
+				 */
+				emul_video(image, memory, palette, IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_DIWSTART, chipreg, BENSON_AT_LINE, IMAGE_HEIGHT, double_pixel_size);
+				/* render sound to sound buffer
+				 * buffer pointer read and write is atomic, so no locking required!
+				 */
+				space = (sound_buffer_readp - sound_buffer_writep - 1 + sound_buffer_size) % sound_buffer_size;
+				if (space < SOUND_SAMPLERATE / IRQ_RATE) {
 #ifdef DEBUG_SOUND_BUFFERING
-				fprintf(stderr, "sound buffer overflow\n");
+					fprintf(stderr, "sound buffer overflow\n");
 #endif
-				length = space;
-			} else
-				length = SOUND_SAMPLERATE / IRQ_RATE;
+					length = space;
+				} else
+					length = SOUND_SAMPLERATE / IRQ_RATE;
 #ifdef DEBUG_SOUND_BUFFERING
-			printf("can write %d, write %d\n", space, length);
-			static int cnt = 0;
-			int s;
-			for (s = 0; s < length; s++) {
-				sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
-				sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
-					= sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
-					* sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
-				 	* sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
-				 cnt++;
-			}
+				printf("can write %d, write %d\n", space, length);
+				static int cnt = 0;
+				int s;
+				for (s = 0; s < length; s++) {
+					sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].left =
+					sound_buffer[(sound_buffer_writep + s) % sound_buffer_size].right
+						= sin(2 * M_PI * 999 * cnt / SOUND_SAMPLERATE)
+						* sin(2 * M_PI * 21 * cnt / SOUND_SAMPLERATE)
+						* sin(2 * M_PI * 0.5 * cnt / SOUND_SAMPLERATE);
+					 cnt++;
+				}
 #else
-			render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
+				render_sound(memory, sound_buffer, sound_buffer_size, sound_buffer_writep, length, config_audio_filter);
 #endif
-			sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
-			diff -= 1000 / IRQ_RATE;
-			last_time += 1000 / IRQ_RATE;
-
-			/* count down render delay */
-			if (render_delay) {
-				render_delay -= 1.0 / (double)IRQ_RATE;
-				if (render_delay < 0.0)
-					render_delay = 0.0;
+				sound_buffer_writep = (sound_buffer_writep + length) % sound_buffer_size;
+				diff -= 1000 / IRQ_RATE;
+				last_time += 1000 / IRQ_RATE;
+
+				/* count down render delay */
+				if (render_delay) {
+					render_delay -= 1.0 / (double)IRQ_RATE;
+					if (render_delay < 0.0)
+						render_delay = 0.0;
+				}
 			}
 		}
 	}
@@ -540,6 +573,23 @@ fail:
 	}
 }
 
+static void osd_info(const char *param, const char *value)
+{
+	char line[41] = "                                        ";
+
+	if (param[0]) {
+		strncpy(line + 21 - strlen(param), param, strlen(param));
+		line[22] = ':';
+	}
+	if (strlen(value) > 15) {
+		print_error("string too long\n");
+		return;
+	}
+	strncpy(line + 25, value, strlen(value));
+	text_render(info_osd, OSD_WIDTH, OSD_HEIGHT, line, 0x00, 4, 0, 0, 1);
+	osd_timer = SDL_GetTicks() + 2500;
+}
+
 static int shift = 0, ctrl = 0;
 
 static void keyboard_sdl(int down, SDL_Keycode sym)
@@ -553,23 +603,30 @@ static void keyboard_sdl(int down, SDL_Keycode sym)
 
 	if (ctrl && down) {
 		switch (sym) {
+		case SDLK_h:
+			help_view ^= 1;
+			break;
 		case SDLK_v:
 			config_video_filter ^= 1;
-			print_info("video filter: %s\n", (config_video_filter) ? "on" : "off");
+			osd_info("video filter", (config_video_filter) ? "on" : "off");
 			break;
 		case SDLK_a:
 			config_audio_filter ^= 1;
-			print_info("audio filter: %s\n", (config_audio_filter) ? "on" : "off");
+			osd_info("audio filter", (config_audio_filter) ? "on" : "off");
 			break;
 		case SDLK_s:
 			config_amiga_speed ^= 1;
-			print_info("amiga speed: %s\n", (config_amiga_speed) ? "original" : "full");
+			osd_info("render speed", (config_amiga_speed) ? "original" : "fast");
 			break;
 		case SDLK_r:
 			config_render ^= 1;
-			print_info("render: %s\n", (config_render) ? "opengl" : "original");
+			osd_info("render mode", (config_render) ? "OpenGL" : "original");
 			break;
 		case SDLK_b:
+			if (!config_render) {
+				osd_info("", "not applicable");
+				break;
+			}
 			if (config_benson_size == 0.5) {
 				config_benson_size = 1.0;
 				config_fov = FOV_NOVAGEN;
@@ -577,7 +634,7 @@ static void keyboard_sdl(int down, SDL_Keycode sym)
 				config_benson_size = 0.5;
 				config_fov = FOV_JOLLY;
 			}
-			print_info("benson: %s\n", (config_benson_size == 0.5) ? "half" : "normal");
+			osd_info("Benson size", (config_benson_size == 0.5) ? "half" : "normal");
 			break;
 		case SDLK_c:
 			if (config_ctrl_c)
@@ -586,18 +643,29 @@ static void keyboard_sdl(int down, SDL_Keycode sym)
 		case SDLK_KP_PLUS:
 			if (config_fov / 1.2 >= FOV_MIN)
 				config_fov /= 1.2;
-			print_info("FOV: %.2f\n", config_fov);
+			disp_fov:
+			{
+				char text[16];
+				sprintf(text, "%.2f", config_fov);
+				osd_info("FOV", text);
+			}
 			break;
 		case SDLK_KP_MINUS:
 			if (config_fov * 1.2 <= FOV_MAX)
 				config_fov *= 1.2;
-			print_info("FOV: %.2f\n", config_fov);
-			break;
+			goto disp_fov;
 		}
 		/* do not pass keys to game while holding CTRL */
 		return;
 	}
 
+	if (sym == SDLK_PAUSE && down)
+		help_view ^= 1;
+
+	/* in help view we don't need to forward keypresses */
+	if (help_view)
+		return;
+
 	switch (sym) {
 	case SDLK_LSHIFT:
 		set_key("LSH", down);
@@ -833,6 +901,63 @@ int main(int argc, char *argv[])
 		goto done;
 	resize_opengl((config_debug_opengl) ? SCREEN_WIDTH * 2 : SCREEN_WIDTH * 3, (config_debug_opengl) ? SCREEN_HEIGHT * 4 : SCREEN_HEIGHT * 3);
 
+	/* init osd */
+	rc = init_osd(0, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2);
+	if (rc < 0)
+		goto done;
+	rc = init_osd(1, OSD_WIDTH, OSD_HEIGHT);
+	if (rc < 0)
+		goto done;
+	help_osd = text_alloc(IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, HELP_ALPHA);
+	if (!help_osd)
+		goto done;
+	text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2, mercenary_name, HELP_ALPHA, 3, (double)(80 - strlen(mercenary_name)) / 2.0, 1, 1);
+	text_render(help_osd, IMAGE_WIDTH * 2, IMAGE_HEIGHT * 2,
+		"Emulation:\n"
+		"        Press `PAUSE' to toggle this help screen on or off.\n"
+		"        Press `CTRL' + `F' to toggle between full screen / window mode.\n"
+		"        Press `CTRL' + `R' to toggle between original / OpenGL rendering.\n"
+		"        Press `CTRL' + `S' to toggle between original / fast rendering.\n"
+		"        Press `CTRL' + `B' to toggle between large / small Benson.\n"
+		"        Press `CTRL' + `V' to toggle video filter on / off.\n"
+		"        Press `CTRL' + `A' to toggle audio filter on / off.\n"
+		"        Press `CTRL' + `+' or `-' to change field-of-view (OpenGL).\n"
+		"        Press `CTRL' + `I' to skip intro (approaching to Eris).\n"
+		"\n"
+		"Answer to a Question:\n"
+		"        Press `O' (not Zero) for OK and other key for NO.\n"
+		"\n"
+		"Walking / Driving / Flying:\n"
+		"        Use cursor keys as joystick, to move player / craft.\n"
+		"        Press `R' for running, 'W' for walking speed.\n"
+		"        Press `B' to board, `L' to leave.\n"
+		"        Press `1'...`0' to drive / fly (slow...fast), `+' or `-' to adjust.\n"
+		"        Press `F1'...`F0' to drive / fly backwards (slow...fast).\n"
+		"        Press `SPACE' to stop craft.\n"
+		"        Press `ESCAPE' to activate escape sequence on crafts.\n"
+		"        Press `T' for turbo on certain craft.\n"
+		"        Press `END' as joystick's fire button.\n"
+		"\n"
+		"Elevator:\n"
+		"        Press `1'...`9' to select floor, 'G' for ground, `B' for basement.\n"
+		"\n"
+		"Inside a transporter:\n"
+		"        Press `1'...`0' to select destination.\n"
+		"\n"
+		"Items:\n"
+		"        Press `SHFIT' + cursor left / right keys to choose item.\n"
+		"        Press `SHFIT' + cursor up / down keys to pickup / drop item.\n"
+		"        Press `NUMPAD Enter' to select certain items.\n"
+		"        Press `NUMPAD +' / `NUMPAD -' to select entries.\n"
+		"        Press `NUMPAD *' to read entry\n"
+		"Saving / Loading / Pause:\n"
+		"        Press `INSERT' to loading and saving options.\n"
+		"        Press `ENTER' to pause game, other key to continue.\n"
+		,HELP_ALPHA, 1, 2, 5, 0);
+	info_osd = text_alloc(OSD_WIDTH, OSD_HEIGHT, 0x00);
+	if (!info_osd)
+		goto done;
+
 	/* init audio filter */
 	sound_init_filter(SOUND_SAMPLERATE);
 
@@ -851,20 +976,6 @@ int main(int argc, char *argv[])
 		} while (event != STOP_AT_WAIT_VBL);
 	}
 
-	print_info("**********************************\n");
-	print_info("* Welcome to Mercenary Reloaded! *\n");
-	print_info("**********************************\n\n");
-	print_info("Press CTRL + cursor keys to select inventory or pickup/drop item.\n");
-	print_info("Press CTRL + f to toggle full screen.\n");
-	print_info("Press CTRL + s to toggle rendering speed.\n");
-	print_info("Press CTRL + v to toggle video filter.\n");
-	print_info("Press CTRL + a to toggle audio filter.\n");
-	print_info("Press CTRL + r to toggle rendering with opengl or orignal code.\n");
-	print_info("Press CTRL + Keypad Plus to decrement FOV.\n");
-	print_info("Press CTRL + Keypad Minus to increment FOV.\n");
-	print_info("Press CTRL + c to exit game.\n\n");
-	print_info("Use '--help' as command line option for configuration settings.\n\n");
-
 	/* run game */
 	main_loop();
 
@@ -882,6 +993,10 @@ done:
 		free(sound_buffer);
 	if (image)
 		free(image);
+	if (help_osd)
+		free(help_osd);
+	if (info_osd)
+		free(info_osd);
 
 	return 0;
 }
diff --git a/src/mercenary/mercenary.h b/src/mercenary/mercenary.h
index 772064a..c3c2a92 100644
--- a/src/mercenary/mercenary.h
+++ b/src/mercenary/mercenary.h
@@ -83,5 +83,6 @@ uint16_t mercenary_poly_tags_color(void);
 int mercenary_background_index(void);
 uint32_t mercenary_planet_scale_index(void);
 uint32_t mercenary_star_table(void);
+extern const char *mercenary_name;
 extern const char *mercenary_gamesavesuffix;
 
diff --git a/src/mercenary/mercenary2.c b/src/mercenary/mercenary2.c
index 1267c75..47b8af5 100644
--- a/src/mercenary/mercenary2.c
+++ b/src/mercenary/mercenary2.c
@@ -262,5 +262,6 @@ uint32_t mercenary_star_table(void)
 	return 0x005D8C0;
 }
 
+const char *mercenary_name = "Mercenary II - Damocles";
 const char *mercenary_gamesavesuffix = ".m2save";
 
diff --git a/src/mercenary/mercenary3.c b/src/mercenary/mercenary3.c
index c2ca7f1..28751e2 100644
--- a/src/mercenary/mercenary3.c
+++ b/src/mercenary/mercenary3.c
@@ -300,5 +300,6 @@ uint32_t mercenary_star_table(void)
 	return DS_84+0x6A;
 }
 
+const char *mercenary_name = "Mercenary III - The Dion Crisis";
 const char *mercenary_gamesavesuffix = ".m3save";
 
diff --git a/src/mercenary/render.c b/src/mercenary/render.c
index 9fbf45f..85498fc 100644
--- a/src/mercenary/render.c
+++ b/src/mercenary/render.c
@@ -335,6 +335,13 @@ void render_capture_start(double _fov, int _extend_roads, int debug)
 
 void render_capture_stop(void)
 {
+	/* no new list (due to STOP_AT_WAIT_INPUT), use old list, if any */
+	if (!render_list_new) {
+		render_list_new = render_list_old;
+		render_list_end = &render_list_new;
+		render_list_old = NULL;
+	}
+
 }
 
 static void gamecolor2gl_index(double *red, double *green, double *blue, uint16_t index)
@@ -2522,6 +2529,18 @@ void render_all_items(double inter)
 		interpolate_objects(inter);
 	}
 
+	/* add a blank background, if render list is empty */
+	if (!render_list_new) {
+		render_item_t blank;
+		memset(&blank, 0, sizeof(blank));
+		blank.type = RENDER_ITEM_SKY;
+		blank.u.sky.red = 0.5;
+		blank.u.sky.green = 0.5;
+		blank.u.sky.blue = 0.5;
+		render_one_item(&blank);
+		return;
+	}
+
 	for (render_item = render_list_new; render_item; render_item = render_item->next) {
 		render_one_item(render_item);
 	}