do binding of VS inputs and FS outputs before linking shader programs, as per OpenGL standard.

should fix the rendering issues with strict drivers (AMD, Intel).

src/GPU3D_OpenGL.cpp

@@ -148,9 +148,6 @@ bool BuildRenderShader(u32 flags, const char* vs, const char* fs)
 
     GLuint prog = RenderShader[flags][2];
 
-    GLint uni_id = glGetUniformBlockIndex(prog, "uConfig");
-    glUniformBlockBinding(prog, uni_id, 0);
-
     glBindAttribLocation(prog, 0, "vPosition");
     glBindAttribLocation(prog, 1, "vColor");
     glBindAttribLocation(prog, 2, "vTexcoord");
@@ -158,6 +155,12 @@ bool BuildRenderShader(u32 flags, const char* vs, const char* fs)
     glBindFragDataLocation(prog, 0, "oColor");
     glBindFragDataLocation(prog, 1, "oAttr");
 
+    if (!OpenGL_LinkShaderProgram(RenderShader[flags]))
+        return false;
+
+    GLint uni_id = glGetUniformBlockIndex(prog, "uConfig");
+    glUniformBlockBinding(prog, uni_id, 0);
+
     glUseProgram(prog);
 
     uni_id = glGetUniformLocation(prog, "TexMem");
@@ -202,6 +205,10 @@ bool Init()
     glBindAttribLocation(ClearShaderPlain[2], 0, "vPosition");
     glBindFragDataLocation(ClearShaderPlain[2], 0, "oColor");
     glBindFragDataLocation(ClearShaderPlain[2], 1, "oAttr");
+
+    if (!OpenGL_LinkShaderProgram(ClearShaderPlain))
+        return false;
+
     ClearUniformLoc[0] = glGetUniformLocation(ClearShaderPlain[2], "uColor");
     ClearUniformLoc[1] = glGetUniformLocation(ClearShaderPlain[2], "uDepth");
     ClearUniformLoc[2] = glGetUniformLocation(ClearShaderPlain[2], "uOpaquePolyID");
@@ -226,12 +233,15 @@ bool Init()
     if (!OpenGL_BuildShaderProgram(kFinalPassVS, kFinalPassFS, FinalPassShader, "FinalPassShader"))
         return false;
 
-    uni_id = glGetUniformBlockIndex(FinalPassShader[2], "uConfig");
-    glUniformBlockBinding(FinalPassShader[2], uni_id, 0);
-
     glBindAttribLocation(FinalPassShader[2], 0, "vPosition");
     glBindFragDataLocation(FinalPassShader[2], 0, "oColor");
 
+    if (!OpenGL_LinkShaderProgram(FinalPassShader))
+        return false;
+
+    uni_id = glGetUniformBlockIndex(FinalPassShader[2], "uConfig");
+    glUniformBlockBinding(FinalPassShader[2], uni_id, 0);
+
     glUseProgram(FinalPassShader[2]);
 
     uni_id = glGetUniformLocation(FinalPassShader[2], "DepthBuffer");

src/OpenGLSupport.cpp

@@ -85,6 +85,14 @@ bool OpenGL_BuildShaderProgram(const char* vs, const char* fs, GLuint* ids, cons
     ids[2] = glCreateProgram();
     glAttachShader(ids[2], ids[0]);
     glAttachShader(ids[2], ids[1]);
+
+    return true;
+}
+
+bool OpenGL_LinkShaderProgram(GLuint* ids)
+{
+    int res;
+
     glLinkProgram(ids[2]);
 
     glGetProgramiv(ids[2], GL_LINK_STATUS, &res);
@@ -94,7 +102,7 @@ bool OpenGL_BuildShaderProgram(const char* vs, const char* fs, GLuint* ids, cons
         if (res < 1) res = 1024;
         char* log = new char[res+1];
         glGetProgramInfoLog(ids[2], res+1, NULL, log);
-        printf("OpenGL: failed to link program %s: %s\n", name, log);
+        printf("OpenGL: failed to link shader program: %s\n", log);
         delete[] log;
 
         glDeleteShader(ids[0]);

src/OpenGLSupport.h

@@ -49,7 +49,7 @@
 
 #ifndef __WIN32__
 
-#define DO_PROCLIST_1_3(func) 
+#define DO_PROCLIST_1_3(func)
 
 #else
 
@@ -131,6 +131,7 @@ DO_PROCLIST(DECLPROC_EXT);
 bool OpenGL_Init();
 
 bool OpenGL_BuildShaderProgram(const char* vs, const char* fs, GLuint* ids, const char* name);
+bool OpenGL_LinkShaderProgram(GLuint* ids);
 void OpenGL_DeleteShaderProgram(GLuint* ids);
 void OpenGL_UseShaderProgram(GLuint* ids);
 

src/libui_sdl/main.cpp

@@ -175,6 +175,13 @@ bool GLScreen_InitShader(GLuint* shader, const char* fs)
     if (!OpenGL_BuildShaderProgram(kScreenVS, fs, shader, "ScreenShader"))
         return false;
 
+    glBindAttribLocation(shader[2], 0, "vPosition");
+    glBindAttribLocation(shader[2], 1, "vTexcoord");
+    glBindFragDataLocation(shader[2], 0, "oColor");
+
+    if (!OpenGL_LinkShaderProgram(shader))
+        return false;
+
     GLuint uni_id;
 
     uni_id = glGetUniformBlockIndex(shader[2], "uConfig");
@@ -186,10 +193,6 @@ bool GLScreen_InitShader(GLuint* shader, const char* fs)
     uni_id = glGetUniformLocation(shader[2], "_3DTex");
     glUniform1i(uni_id, 1);
 
-    glBindAttribLocation(shader[2], 0, "vPosition");
-    glBindAttribLocation(shader[2], 1, "vTexcoord");
-    glBindFragDataLocation(shader[2], 0, "oColor");
-
     return true;
 }
 
@@ -198,7 +201,7 @@ bool GLScreen_Init()
     // TODO: consider using epoxy?
     if (!OpenGL_Init())
         return false;
-        
+
     const GLubyte* renderer = glGetString(GL_RENDERER); // get renderer string
     const GLubyte* version = glGetString(GL_VERSION); // version as a string
     printf("OpenGL: renderer: %s\n", renderer);
@@ -255,7 +258,7 @@ void GLScreen_DeInit()
 void GLScreen_DrawScreen()
 {
     float scale = uiGLGetFramebufferScale(GLContext);
-    
+
     if (GL_ScreenSizeDirty)
     {
         GL_ScreenSizeDirty = false;
@@ -2540,7 +2543,7 @@ int main(int argc, char** argv)
     if (MicDevice)   SDL_CloseAudioDevice(MicDevice);
 
     if (MicWavBuffer) delete[] MicWavBuffer;
-    
+
     if (ScreenBitmap[0]) uiDrawFreeBitmap(ScreenBitmap[0]);
     if (ScreenBitmap[1]) uiDrawFreeBitmap(ScreenBitmap[1]);