+
+/**
+ * Prior to drawing anything with glBegin, glDrawArrays, etc. this function
+ * is called to see if it's valid to render. This involves checking that
+ * the current shader is valid and the framebuffer is complete.
+ * If an error is detected it'll be recorded here.
+ * \return GL_TRUE if OK to render, GL_FALSE if not
+ */
+GLboolean
+_mesa_valid_to_render(GLcontext *ctx, const char *where)
+{
+ if (ctx->Shader.CurrentProgram) {
+ /* using shaders */
+ if (!ctx->Shader.CurrentProgram->LinkStatus) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "%s(shader not linked), where");
+ return GL_FALSE;
+ }
+#if 0 /* not normally enabled */
+ {
+ char errMsg[100];
+ if (!_mesa_validate_shader_program(ctx, ctx->Shader.CurrentProgram,
+ errMsg)) {
+ _mesa_warning(ctx, "Shader program %u is invalid: %s",
+ ctx->Shader.CurrentProgram->Name, errMsg);
+ }
+ }
+#endif
+ }
+ else {
+ if (ctx->VertexProgram.Enabled && !ctx->VertexProgram._Enabled) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "%s(vertex program not valid)", where);
+ return GL_FALSE;
+ }
+ if (ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "%s(fragment program not valid)", where);
+ return GL_FALSE;
+ }
+ }
+
+ if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+ _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
+ "%s(incomplete framebuffer)", where);
+ return GL_FALSE;
+ }
+
+#ifdef DEBUG
+ if (ctx->Shader.Flags & GLSL_LOG) {
+ struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
+ if (shProg) {
+ if (!shProg->_Used) {
+ /* This is the first time this shader is being used.
+ * Append shader's constants/uniforms to log file.
+ */
+ GLuint i;
+ for (i = 0; i < shProg->NumShaders; i++) {
+ struct gl_shader *sh = shProg->Shaders[i];
+ if (sh->Type == GL_VERTEX_SHADER) {
+ _mesa_append_uniforms_to_file(sh,
+ &shProg->VertexProgram->Base);
+ }
+ else if (sh->Type == GL_FRAGMENT_SHADER) {
+ _mesa_append_uniforms_to_file(sh,
+ &shProg->FragmentProgram->Base);
+ }
+ }
+ shProg->_Used = GL_TRUE;
+ }
+ }
+ }
+#endif
+
+ return GL_TRUE;
+}
+
+