Add transparent index and optimize font rendering with shadows.

Author: nopjne

CMakeLists.txt

@@ -38,6 +38,8 @@ if(MSVC)
     string(REGEX REPLACE "/W3" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
     # we would probably like to pass /Wall instead of /W4, but there's a lot
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /permissive- /W4")
+    #LibPNG is not linking on MSVC correctly, disable it.
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DMIN_BUILD")
 else()
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wno-unused-parameter -Wformat -pedantic -Wvla")
     set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -ggdb -DDEBUGMODE -Werror -fno-omit-frame-pointer")
@@ -235,6 +237,8 @@ add_dependencies(openomf copy_shaders)
 
 # Build tools if requested
 set(TOOL_TARGET_NAMES)
+
+
 # always build languagetool, for BuildLanguages.cmake
 add_executable(languagetool tools/languagetool/main.c)
 list(APPEND TOOL_TARGET_NAMES languagetool)

src/formats/bk.c

@@ -10,6 +10,7 @@
 #include "formats/internal/writer.h"
 #include "formats/palette.h"
 #include "formats/pcx.h"
+#include "formats/transparent.h"
 #include "formats/vga_image.h"
 #include "utils/allocator.h"
 
@@ -134,7 +135,7 @@ int sd_bk_load(sd_bk_file *bk, const char *filename) {
 
     // Read background image
     bk->background = omf_calloc(1, sizeof(sd_vga_image));
-    if((ret = sd_vga_image_create(bk->background, img_w, img_h)) != SD_SUCCESS) {
+    if((ret = sd_vga_image_create(bk->background, img_w, img_h, BACKGROUND_TRANSPARENT_INDEX)) != SD_SUCCESS) {
         goto exit_0;
     }
     int bsize = img_w * img_h;

src/formats/fonts.c

@@ -4,6 +4,7 @@
 #include "formats/fonts.h"
 #include "formats/internal/reader.h"
 #include "formats/internal/writer.h"
+#include <assert.h>
 
 int sd_font_create(sd_font *font) {
     if(font == NULL) {
@@ -57,18 +58,20 @@ int sd_font_save(const sd_font *font, const char *file) {
     return SD_SUCCESS;
 }
 
-int sd_font_decode(const sd_font *font, sd_vga_image *o, uint8_t ch, uint8_t color) {
+int sd_font_decode(const sd_font *font, sd_vga_image *o, uint8_t ch, uint8_t color, int transparent) {
     if(font == NULL || o == NULL || ch >= 224) {
         return SD_INVALID_INPUT;
     }
 
+    assert((transparent >= 0) && (transparent < 256));
+
     int t = 0;
     for(unsigned i = 0; i < font->h; i++) {
         for(int k = font->h - 1; k >= 0; k--) {
             if(font->chars[ch].data[i] & (1 << k)) {
                 o->data[t] = color;
             } else {
-                o->data[t] = 0;
+                o->data[t] = (char)transparent;
             }
             t++;
         }

src/formats/fonts.h

@@ -93,7 +93,7 @@ int sd_font_save(const sd_font *font, const char *filename);
  * \param ch Character to load. Must be 0 <= ch <= 224.
  * \param color Color palette index (0 - 0xFF)
  */
-int sd_font_decode(const sd_font *font, sd_vga_image *surface, uint8_t ch, uint8_t color);
+int sd_font_decode(const sd_font *font, sd_vga_image *surface, uint8_t ch, uint8_t color, int transparent);
 
 /**
  * Same as sd_font_decode, but decodes to an RGBA surface.

src/formats/pcx.c

@@ -1,7 +1,9 @@
 #include "formats/pcx.h"
 #include "formats/error.h"
 #include "formats/internal/reader.h"
+#include "formats/transparent.h"
 #include "utils/allocator.h"
+#include <assert.h>
 #include <inttypes.h>
 #include <stdio.h>
 #include <string.h>
@@ -69,7 +71,7 @@ int pcx_load(pcx_file *pcx, const char *filename) {
     }
 
     int ret;
-    if((ret = sd_vga_image_create(&(pcx->image), 320, 200)) != SD_SUCCESS) {
+    if((ret = sd_vga_image_create(&(pcx->image), 320, 200, FONT_TRANSPARENT_INDEX)) != SD_SUCCESS) {
         return ret;
     }
 
@@ -141,19 +143,22 @@ int pcx_load_font(pcx_font *font, const char *filename) {
     return SD_SUCCESS;
 }
 
-int pcx_font_decode(const pcx_font *font, sd_vga_image *o, uint8_t ch, int8_t palette_offset) {
+int pcx_font_decode(const pcx_font *font, sd_vga_image *o, uint8_t ch, int8_t palette_offset, int transparent) {
     if(ch >= font->glyph_count || font == NULL || o == NULL) {
         return SD_INVALID_INPUT;
     }
 
+    // Fonts always need to have a transparent value.
+    assert((transparent >= 0) && (transparent < 256));
+
     int k = 0;
     for(int i = font->glyphs[ch].y; i < font->glyphs[ch].y + font->glyph_height; i++) {
         int l = 0;
         for(int j = font->glyphs[ch].x; j < font->glyphs[ch].x + font->glyphs[ch].width; j++) {
             if(font->pcx.image.data[(i * 320) + j]) {
                 o->data[(k * font->glyphs[ch].width) + l] = palette_offset + (int)font->pcx.image.data[(i * 320) + j];
             } else {
-                o->data[(k * font->glyphs[ch].width) + l] = 0;
+                o->data[(k * font->glyphs[ch].width) + l] = transparent;
             }
 
             l++;

src/formats/pcx.h

@@ -49,7 +49,7 @@ typedef struct {
 
 int pcx_load(pcx_file *pcx, const char *filename);
 int pcx_load_font(pcx_font *font, const char *filename);
-int pcx_font_decode(const pcx_font *font, sd_vga_image *o, uint8_t ch, int8_t palette_offset);
+int pcx_font_decode(const pcx_font *font, sd_vga_image *o, uint8_t ch, int8_t palette_offset, int transparent);
 void pcx_free(pcx_file *pcx);
 void pcx_font_free(pcx_font *font);
 

src/formats/sprite.c

@@ -4,6 +4,7 @@
 #include "formats/error.h"
 #include "formats/palette.h"
 #include "formats/sprite.h"
+#include "formats/transparent.h"
 #include "utils/allocator.h"
 
 int sd_sprite_create(sd_sprite *sprite) {
@@ -271,6 +272,7 @@ int sd_sprite_vga_decode(sd_vga_image *dst, const sd_sprite *src) {
     uint16_t c = 0;
     uint16_t data = 0;
     char op = 0;
+    int transparent = SPRITE_TRANSPARENT_INDEX;
 
     // Make sure we aren't being fed BS
     if(dst == NULL || src == NULL) {
@@ -279,9 +281,9 @@ int sd_sprite_vga_decode(sd_vga_image *dst, const sd_sprite *src) {
 
     // If image data length is 0, then size should be 1x1
     if(src->len > 0) {
-        sd_vga_image_create(dst, src->width, src->height);
+        sd_vga_image_create(dst, src->width, src->height, transparent);
     } else {
-        sd_vga_image_create(dst, 1, 1);
+        sd_vga_image_create(dst, 1, 1, transparent);
     }
 
     // XXX CREDITS.BK has a bunch of 0 width sprites, for some unknown reason
@@ -310,6 +312,7 @@ int sd_sprite_vga_decode(sd_vga_image *dst, const sd_sprite *src) {
                     uint8_t b = src->data[i];
                     int pos = ((y * src->width) + x);
                     dst->data[pos] = b;
+                    assert(b != transparent);
                     i++; // we read 1 byte
                     x++;
                     data--;
@@ -324,6 +327,8 @@ int sd_sprite_vga_decode(sd_vga_image *dst, const sd_sprite *src) {
         }
     }
 
+    dst->transparent = transparent;
+
     // All done. dst should now contain a valid vga image.
     return SD_SUCCESS;
 }

src/formats/transparent.h

@@ -0,0 +1,40 @@
+/*! \file
+ * \brief Transparent VGA pixel values
+ * \details Describes the transparancy index value for various engine components.
+ * \copyright MIT license.
+ * \date 2024
+ * \author Andrew Thompson
+ * \author Tuomas Virtanen
+ */
+
+#ifndef TRANSPARENT_H
+#define TRANSPARENT_H
+
+// Default's.
+// Please do not use the default definitions in the code directly. Define a new value below instead.
+// This way all different transparency values are stored in one place.
+#define DEFAULT_TRANSPARENT_INDEX 0
+#define DEFAULT_NOT_TRANSPARENT -1
+
+// All sprites have holes, these holes need to be transparent.
+#define SPRITE_TRANSPARENT_INDEX DEFAULT_TRANSPARENT_INDEX
+
+// Backgrounds have no transparent pixels and need all pixels to be rendered.
+#define BACKGROUND_TRANSPARENT_INDEX DEFAULT_NOT_TRANSPARENT
+
+// Force an opaque menu for now.
+#define MENU_TRANSPARENT_INDEX DEFAULT_NOT_TRANSPARENT
+
+// Portraits have a transparancy index that needs to offset past other items in the global palette.
+// TODO: Should really become default.
+#define PORTRAIT_TRANSPARENT_INDEX 0xD0
+
+// Fonts need a transparent index that does not conflict with the lower 8 colors on the N64 otherwise there will be a
+// combinatorial explosion.
+#define FONT_TRANSPARENT_INDEX DEFAULT_TRANSPARENT_INDEX
+#define PCX_FONT_TRANSPARENT_INDEX DEFAULT_TRANSPARENT_INDEX
+
+// Gauges in the player select have an opaque background and are not transparent.
+#define GAUGE_TRANSPARENT_INDEX DEFAULT_NOT_TRANSPARENT
+
+#endif

src/formats/vga_image.c

@@ -1,22 +1,32 @@
+#if !defined(MIN_BUILD)
 #include <png.h>
+#endif
+#include <assert.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "formats/error.h"
+#include "formats/transparent.h"
 #include "formats/vga_image.h"
 #include "utils/allocator.h"
 #include "utils/png_writer.h"
 
-int sd_vga_image_create(sd_vga_image *img, unsigned int w, unsigned int h) {
+int sd_vga_image_create(sd_vga_image *img, unsigned int w, unsigned int h, int transparent) {
     if(img == NULL) {
         return SD_INVALID_INPUT;
     }
     img->w = w;
     img->h = h;
     img->len = w * h;
-    img->data = omf_calloc(1, w * h);
+    img->transparent = transparent;
+    img->data = omf_alloc_with_options(1, img->len, ALLOC_HINT_TEXTURE);
+    assert((img->data != NULL) || (img->len == 0));
+    if(img->data != NULL) {
+        memset(img->data, 0, img->len);
+    }
+
     return SD_SUCCESS;
 }
 
@@ -27,7 +37,8 @@ int sd_vga_image_copy(sd_vga_image *dst, const sd_vga_image *src) {
     dst->w = src->w;
     dst->h = src->h;
     dst->len = src->len;
-    dst->data = omf_calloc(src->len, 1);
+    dst->data = omf_malloc(src->len);
+    dst->transparent = src->transparent;
     memcpy(dst->data, src->data, src->len);
     return SD_SUCCESS;
 }
@@ -36,7 +47,7 @@ void sd_vga_image_free(sd_vga_image *img) {
     if(img == NULL) {
         return;
     }
-    omf_free(img->data);
+    omf_free_with_options(img->data, ALLOC_HINT_TEXTURE);
 }
 
 int sd_vga_image_decode(sd_rgba_image *dst, const sd_vga_image *src, const vga_palette *pal) {
@@ -62,6 +73,9 @@ int sd_vga_image_decode(sd_rgba_image *dst, const sd_vga_image *src, const vga_p
 }
 
 int sd_vga_image_from_png(sd_vga_image *img, const char *filename) {
+#if defined(MIN_BUILD)
+    return 0;
+#else
     png_structp png_ptr;
     png_infop info_ptr;
     int ret = SD_SUCCESS;
@@ -136,7 +150,7 @@ int sd_vga_image_from_png(sd_vga_image *img, const char *filename) {
     png_read_image(png_ptr, row_pointers);
 
     // Convert
-    if(sd_vga_image_create(img, w, h) != SD_SUCCESS) {
+    if(sd_vga_image_create(img, w, h, DEFAULT_NOT_TRANSPARENT) != SD_SUCCESS) {
         ret = SD_OUT_OF_MEMORY;
         goto error_3;
     }
@@ -159,6 +173,7 @@ int sd_vga_image_from_png(sd_vga_image *img, const char *filename) {
     fclose(handle);
 error_0:
     return ret;
+#endif
 }
 
 int sd_vga_image_to_png(const sd_vga_image *img, const vga_palette *pal, const char *filename) {

src/formats/vga_image.h

@@ -27,6 +27,7 @@ typedef struct {
     unsigned int h;   ///< Pixel height
     unsigned int len; ///< Byte length
     char *data;       ///< Palette representation of image data
+    int transparent;
 } sd_vga_image;
 
 /*! \brief Initialize VGA image structure
@@ -41,7 +42,7 @@ typedef struct {
  * \param w Image width in pixels
  * \param h Image height in pixels
  */
-int sd_vga_image_create(sd_vga_image *img, unsigned int w, unsigned int h);
+int sd_vga_image_create(sd_vga_image *img, unsigned int w, unsigned int h, int transparent);
 
 /*! \brief Copy VGA image structure
  *