Test paletted stuff

src/dusk/asset/type/assettexture.c

@@ -50,7 +50,10 @@ errorret_t assetTextureLoad(assetentire_t entire) {
     assetData->height,
     TEXTURE_FORMAT_PALETTE,
     (texturedata_t){
-      .paletteData = assetData->palette
+      .paletted = {
+        .indices = NULL,
+        .palette = NULL
+      }
     }
   );
 

src/dusk/display/display.c

@@ -38,16 +38,27 @@ errorret_t displayInit(void) {
   errorChain(textInit());
   errorChain(screenInit());
 
-  color_t pixels[2 * 2] = {
-    COLOR_RED, COLOR_GREEN,
-    COLOR_BLUE, COLOR_WHITE
+  PALETTES[0].colors[0] = COLOR_RED;
+  PALETTES[0].colors[1] = COLOR_GREEN;
+  PALETTES[0].colors[2] = COLOR_BLUE;
+  PALETTES[0].colors[3] = COLOR_WHITE;
+  PALETTES[0].count = 4;
+  
+  uint8_t indices[4 * 4] = {
+    0, 1, 2, 3,
+    3, 2, 1, 0,
+    0, 1, 2, 3,
+    3, 2, 1, 0,
   };
   errorChain(textureInit(
     &TEXTURE,
-    2, 2,
-    TEXTURE_FORMAT_RGBA,
+    4, 4,
+    TEXTURE_FORMAT_PALETTE,
     (texturedata_t){
-      .rgbaColors = pixels
+      .paletted = {
+        .indices = indices,
+        .palette = &PALETTES[0]
+      }
     }
   ));
 
@@ -79,9 +90,9 @@ errorret_t displayUpdate(void) {
   // camera.orthographic.top = SCREEN.height;
   // camera.orthographic.bottom = 0.0f;
   cameraInitPerspective(&camera);
-  camera.lookat.position[0] = 10.0f;
-  camera.lookat.position[1] = 10.0f;
-  camera.lookat.position[2] = 10.0f;
+  camera.lookat.position[0] = 3.0f;
+  camera.lookat.position[1] = 3.0f;
+  camera.lookat.position[2] = 3.0f;
 
   mat4 proj, view, model;
   cameraGetProjectionMatrix(&camera, proj);

src/dusk/display/texture/CMakeLists.txt

@@ -8,4 +8,5 @@ target_sources(${DUSK_LIBRARY_TARGET_NAME}
   PUBLIC
     tileset.c
     texture.c
+    palette.c
 )

src/dusk/display/texture/palette.c

@@ -0,0 +1,10 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "palette.h"
+
+palette_t PALETTES[PALETTE_COUNT];

src/dusk/display/texture/palette.h

@@ -0,0 +1,19 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "display/color.h"
+
+#define PALETTE_COLOR_COUNT 256
+#define PALETTE_COUNT 6
+
+typedef struct {
+  color_t colors[PALETTE_COLOR_COUNT];
+  uint8_t count;
+} palette_t;
+
+extern palette_t PALETTES[PALETTE_COUNT];

src/dusk/display/texture/texture.h

@@ -7,7 +7,7 @@
 
 #pragma once
 #include "error/error.h"
-#include "display/color.h"
+#include "display/texture/palette.h"
 #include "display/texture/textureplatform.h"
 
 #ifndef textureInitPlatform
@@ -20,8 +20,13 @@
 typedef textureformatplatform_t textureformat_t;
 typedef textureplatform_t texture_t;
 
+typedef struct {
+  uint8_t *indices;
+  palette_t *palette;
+} texturepalettedata_t;
+
 typedef union texturedata_u {
-  uint8_t *paletteData;
+  texturepalettedata_t paletted;
   color_t *rgbaColors;
 } texturedata_t;
 

src/duskgl/display/shader/shadergl.c

@@ -224,6 +224,33 @@ errorret_t shaderSetTextureGL(
     errorChain(errorGLCheck());
     glUniform1i(location, 0);
     errorChain(errorGLCheck());
+
+    if(texture->format == TEXTURE_FORMAT_PALETTE) {
+      shaderParamGetLocationGL(shader, "u_ColorCount", &location);
+      glUniform1i(location, texture->palette->count);
+      errorChain(errorGLCheck());
+
+      shaderParamGetLocationGL(shader, "u_Colors", &location);
+      GLuint paletteData[texture->palette->count];
+      for(size_t i = 0; i < texture->palette->count; i++) {
+        color_t color = texture->palette->colors[i];
+        paletteData[i] = (
+          ((uint32_t)color.r << 24) |
+          ((uint32_t)color.g << 16) |
+          ((uint32_t)color.b << 8)  |
+          ((uint32_t)color.a << 0)
+        );
+      }
+      glUniform1uiv(location, texture->palette->count, paletteData);
+      errorChain(errorGLCheck());
+    }
+
+    // PALETTE TEST
+    // errorChain(shaderParamGetLocationGL(shader, "u_Palette", &location));
+    // glActiveTexture(GL_TEXTURE1);
+    // errorChain(errorGLCheck());
+
+
   #endif
 
   errorOk();

src/duskgl/display/shader/shaderunlitgl.c

@@ -13,28 +13,39 @@
   shaderdefinition_t SHADER_UNLIT_DEFINITION = {
     .vert =
       "#version 330 core\n"
-      "layout(location = 0) in vec3 aPos;\n"
-      "layout(location = 1) in vec2 aTexCoord;\n"
-      "layout(location = 2) in vec4 aColor;\n"
+      "layout(location = 0) in vec3 a_Pos;\n"
+      "layout(location = 1) in vec2 a_TexCoord;\n"
+      "layout(location = 2) in vec4 a_Color;\n"
       "uniform mat4 u_Proj;\n"
       "uniform mat4 u_View;\n"
       "uniform mat4 u_Model;\n"
       "out vec4 v_Color;\n"
       "out vec2 v_TexCoord;\n"
       "void main() {\n"
-      "  gl_Position = u_Proj * u_View * u_Model * vec4(aPos, 1.0);\n"
-      "  v_Color = aColor;\n"
-      "  v_TexCoord = aTexCoord;\n"
+      "  gl_Position = u_Proj * u_View * u_Model * vec4(a_Pos, 1.0);\n"
+      "  v_Color = a_Color;\n"
+      "  v_TexCoord = a_TexCoord;\n"
       "}\n",
 
     .frag =
       "#version 330 core\n"
       "uniform sampler2D u_Texture;\n"
+      "uniform uint u_Colors[256];\n"
+      "uniform int u_ColorCount;\n"
       "in vec4 v_Color;\n"
       "in vec2 v_TexCoord;\n"
       "out vec4 FragColor;\n"
       "void main() {\n"
-      "  FragColor = texture(u_Texture, v_TexCoord) * v_Color;\n"
+      "  vec4 texColor = texture(u_Texture, v_TexCoord);\n"
+      "  uint index = uint(floor(texColor.r * 255.0));\n"
+      "  uint palColor = u_Colors[index];\n"
+      "  float r = float((palColor >> 24) & 0xFFu) / 255.0;\n"
+      "  float g = float((palColor >> 16) & 0xFFu) / 255.0;\n"
+      "  float b = float((palColor >> 8)  & 0xFFu) / 255.0;\n"
+      "  float a = float((palColor >> 0)  & 0xFFu) / 255.0;\n"
+      "  vec4 paletteColor = vec4(r, g, b, a);\n"
+      "  FragColor = paletteColor;\n"
+      // "  FragColor = paletteColor * v_Color;\n"
       "}\n"
   };
 #endif

src/duskgl/display/texture/texturegl.c

@@ -8,6 +8,7 @@
 #include "display/texture/texture.h"
 #include "assert/assert.h"
 #include "error/errorgl.h"
+#include "util/memory.h"
 
 errorret_t textureInitGL(
   texturegl_t *texture,
@@ -29,20 +30,32 @@ errorret_t textureInitGL(
       break;
 
     case TEXTURE_FORMAT_PALETTE:
-      assertNotNull(data.paletteData, "Palette texture data cannot be NULL");
-      glTexImage2D(
-        GL_TEXTURE_2D,
-        0, GL_COLOR_INDEX8_EXT,
-        width, height,
-        0, GL_COLOR_INDEX8_EXT,
-        GL_UNSIGNED_BYTE, (void*)data.paletteData
-      );
-      errorChain(errorGLCheck());
-
-      // glColorTableEXT(
-      //   GL_TEXTURE_2D, GL_RGBA, data.palette.palette->colorCount, GL_RGBA,
-      //   GL_UNSIGNED_BYTE, (const void*)data.palette.palette->colors
-      // );
+      assertNotNull(data.paletted.indices, "Palette indices cannot be NULL");
+      assertNotNull(data.paletted.palette, "Palette colors cannot be NULL");
+      #ifdef DUSK_OPENGL_LEGACY
+        glTexImage2D(
+          GL_TEXTURE_2D,
+          0, GL_COLOR_INDEX8_EXT,
+          width, height,
+          0, GL_COLOR_INDEX8_EXT,
+          GL_UNSIGNED_BYTE, (void*)data.paletted.indices
+        );
+        errorChain(errorGLCheck());
+        glColorTableEXT(
+          GL_TEXTURE_2D, GL_RGBA, data.paletted.palette->count, GL_RGBA,
+          GL_UNSIGNED_BYTE, (const void*)data.paletted.palette->colors
+        );
+        errorChain(errorGLCheck());
+      #else
+        // For modern systems we send to only the R channel and the shader does
+        // the rest.
+        glTexImage2D(
+          GL_TEXTURE_2D, 0, GL_RED, width, height, 0,
+          GL_RED, GL_UNSIGNED_BYTE, (void*)data.paletted.indices
+        );
+        errorChain(errorGLCheck());
+        texture->palette = data.paletted.palette;
+      #endif
       break;
 
     default:
@@ -69,5 +82,6 @@ errorret_t textureDisposeGL(texturegl_t *texture) {
 
   glDeleteTextures(1, &texture->id);
   errorChain(errorGLCheck());
+
   errorOk();
 }

src/duskgl/display/texture/texturegl.h

@@ -20,6 +20,10 @@ typedef struct {
   textureformatgl_t format;
   int32_t width;
   int32_t height;
+
+  union {
+    palette_t *palette;
+  };
 } texturegl_t;
 
 /**