Moved texture setting around

src/duskgl/display/shader/shadergl.c

@@ -28,6 +28,11 @@ errorret_t shaderInitGL(shadergl_t *shader, const shaderdefinitiongl_t *def) {
     SHADER_LEGACY.boundShader = NULL;
     errorOk();
   #else
+    assertNotNull(def->vert, "Vertex shader source cannot be null");
+    assertNotNull(def->frag, "Fragment shader source cannot be null");
+
+    shader->setTexture = def->setTexture;
+
     // Create vertex shader
     shader->vertexShaderId = glCreateShader(GL_VERTEX_SHADER);
     errorret_t err = errorGLCheck();
@@ -212,6 +217,12 @@ errorret_t shaderSetTextureGL(
   assertStrLenMin(name, 1, "Uniform name cannot be empty");
 
   #ifdef DUSK_OPENGL_LEGACY
+    assertStringEqual(
+      name,
+      SHADER_UNLIT_TEXTURE,
+      "Only one texture supported in legacy opengl."
+    )
+
     if(texture == NULL) {
       glDisable(GL_TEXTURE_2D);
       errorChain(errorGLCheck());
@@ -226,44 +237,10 @@ errorret_t shaderSetTextureGL(
     errorChain(errorGLCheck());
 
   #else
-    if(texture == NULL) {
-      glActiveTexture(GL_TEXTURE0);
-      errorChain(errorGLCheck());
-      glBindTexture(GL_TEXTURE_2D, 0);
-      errorChain(errorGLCheck());
-      errorOk();
+    if(shader->setTexture == NULL) {
+      assertUnreachable("Shader does not support setting textures.");
     }
-    
-    GLint location;
-    errorChain(shaderParamGetLocationGL(shader, name, &location));
-
-    glActiveTexture(GL_TEXTURE0);
-    errorChain(errorGLCheck());
-    glBindTexture(GL_TEXTURE_2D, texture->id);
-    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());
-    }
-    
+    errorChain(shader->setTexture(shader, name, texture));
   #endif
 
   errorOk();