Palettized image test.

src/display/texture/texture.c

@@ -9,6 +9,7 @@
 #include "assert/assert.h"
 #include "util/memory.h"
 #include "util/math.h"
+#include "display/palette/palettelist.h"
 
 const texture_t *TEXTURE_BOUND = NULL;
 
@@ -17,7 +18,7 @@ void textureInit(
   const int32_t width,
   const int32_t height,
   const textureformat_t format,
-  const void *data
+  const texturedata_t data
 ) {
   assertNotNull(texture, "Texture cannot be NULL");
   assertTrue(width > 0 && height > 0, "width/height must be greater than 0");
@@ -40,15 +41,96 @@ void textureInit(
   #if DISPLAY_SDL2
     glGenTextures(1, &texture->id);
     glBindTexture(GL_TEXTURE_2D, texture->id);
-    glTexImage2D(
-      GL_TEXTURE_2D, 0, format, width, height, 0,
-      format, GL_UNSIGNED_BYTE, data
-    );
+
+    switch(format) {
+      case TEXTURE_FORMAT_RGBA:
+        assertNotNull(data.rgba.colors, "RGBA texture data cannot be NULL");
+        glTexImage2D(
+          GL_TEXTURE_2D, 0, format, width, height, 0,
+          format, GL_UNSIGNED_BYTE, (void*)data.rgba.colors
+        );
+        break;
+
+      case TEXTURE_FORMAT_ALPHA:
+        assertNotNull(data.alpha.data, "Alpha texture data cannot be NULL");
+        glTexImage2D(
+          GL_TEXTURE_2D, 0, format, width, height, 0,
+          format, GL_UNSIGNED_BYTE, (void*)data.alpha.data
+        );
+        break;
+
+      case TEXTURE_FORMAT_PALETTE:
+        assertNotNull(data.palette.data, "Palette texture data cannot be NULL");
+        assertTrue(
+          data.palette.palette < PALETTE_LIST_COUNT,
+          "Palette index out of range"
+        );
+
+        const palette_t *pal = PALETTE_LIST[data.palette.palette];
+        assertNotNull(pal, "Palette cannot be NULL");
+        GLenum err = glGetError();
+        if (err != GL_NO_ERROR) {
+          assertUnreachable("GL Error before setting color table");
+        }
+
+        // Do we support paletted textures?
+        bool_t havePalTex = false;
+        GLint mask = 0;
+        glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &mask);
+        if(mask & GL_CONTEXT_CORE_PROFILE_BIT) {
+          GLint n=0; glGetIntegerv(GL_NUM_EXTENSIONS, &n);
+          for (GLint i=0; i<n; ++i) {
+            const char* e = (const char*)glGetStringi(GL_EXTENSIONS, i);
+            if (e && strcmp(e, "GL_EXT_paletted_texture")==0) { havePalTex = true; break; }
+          }
+        } else {
+          const char* ext = (const char*)glGetString(GL_EXTENSIONS);
+          havePalTex = ext && strstr(ext, "GL_EXT_paletted_texture");
+        }
+
+        if(!havePalTex) {
+          // Not supported, convert to RGBA using lookup
+          color_t formatted[width * height];
+          for(int32_t i = 0; i < width * height; i++) {
+            uint8_t index = data.palette.data[i];
+            assertTrue(
+              index < pal->colorCount,
+              "Palette index out of range"
+            );
+            formatted[i] = pal->colors[index];
+          }
+          glTexImage2D(
+            GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
+            GL_RGBA, GL_UNSIGNED_BYTE, (void*)formatted
+          );
+        } else {
+          // Supported.
+          glColorTableEXT(
+            GL_TEXTURE_2D, GL_RGBA, pal->colorCount, GL_RGBA,
+            GL_UNSIGNED_BYTE, (const void*)pal->colors
+          );
+          glTexImage2D(
+            GL_TEXTURE_2D,
+            0, GL_COLOR_INDEX8_EXT,
+            width, height,
+            0, GL_COLOR_INDEX8_EXT,
+            GL_UNSIGNED_BYTE, (void*)data.palette.data
+          );
+        }
+
+        break;
+
+      default:
+        assertUnreachable("Unknown texture format");
+        break;
+    }
 
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
     
     glBindTexture(GL_TEXTURE_2D, 0);
   #endif