From ccef2110edbcc418abebabecc42ee3d9c0e5ab7a Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Tue, 26 Oct 2010 18:01:50 -0600
Subject: [PATCH] mesa: call _mesa_valid_to_render() in glDrawPixels,
 glCopyPixels, glBitmap

This lets us simplify and consolidate some state checking code.

This implements the GL_INVALID_OPERATION check for all drawing commands
required by GL_EXT_texture_integer.
---
 src/mesa/main/drawpix.c | 76 ++++++++---------------------------------
 1 file changed, 15 insertions(+), 61 deletions(-)

diff --git a/src/mesa/main/drawpix.c b/src/mesa/main/drawpix.c
index 890d0ab5a72..46adc67c1c5 100644
--- a/src/mesa/main/drawpix.c
+++ b/src/mesa/main/drawpix.c
@@ -40,17 +40,6 @@
 #if FEATURE_drawpix
 
 
-/**
- * If a fragment program is enabled, check that it's valid.
- * \return GL_TRUE if valid, GL_FALSE otherwise
- */
-static GLboolean
-valid_fragment_program(struct gl_context *ctx)
-{
-   return !(ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled);
-}
-
-
 /*
  * Execute glDrawPixels
  */
@@ -67,41 +56,21 @@ _mesa_DrawPixels( GLsizei width, GLsizei height,
    }
 
    /* We're not using the current vertex program, and the driver may install
-    * it's own.
+    * its own.  Note: this may dirty some state.
     */
    _mesa_set_vp_override(ctx, GL_TRUE);
 
-   if (ctx->NewState) {
-      _mesa_update_state(ctx);
-   }
-
-   if (!valid_fragment_program(ctx)) {
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glDrawPixels (invalid fragment program)");
-      goto end;
+   /* Note: this call does state validation */
+   if (!_mesa_valid_to_render(ctx, "glDrawPixels")) {
+      goto end;      /* the error code was recorded */
    }
 
    if (_mesa_error_check_format_type(ctx, format, type, GL_TRUE)) {
-      /* the error was already recorded */
-      goto end;
-   }
-
-   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
-      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
-                  "glDrawPixels(incomplete framebuffer)" );
-      goto end;
+      goto end;      /* the error code was recorded */
    }
 
    if (!ctx->Current.RasterPosValid) {
-      goto end; /* no-op, not an error */
-   }
-
-   if (_mesa_is_integer_format(format) &&
-       !_mesa_is_fragment_shader_active(ctx)) {
-      /* A fragment shader is required when drawing integer formats */
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glDrawPixels(integer format but no fragment shader)");
-      goto end;
+      goto end;  /* no-op, not an error */
    }
 
    if (ctx->RenderMode == GL_RENDER) {
@@ -175,22 +144,17 @@ _mesa_CopyPixels( GLint srcx, GLint srcy, GLsizei width, GLsizei height,
    }
 
    /* We're not using the current vertex program, and the driver may install
-    * it's own.
+    * it's own.  Note: this may dirty some state.
     */
    _mesa_set_vp_override(ctx, GL_TRUE);
 
-   if (ctx->NewState) {
-      _mesa_update_state(ctx);
-   }
-
-   if (!valid_fragment_program(ctx)) {
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glCopyPixels (invalid fragment program)");
-      goto end;
+   /* Note: this call does state validation */
+   if (!_mesa_valid_to_render(ctx, "glCopyPixels")) {
+      goto end;      /* the error code was recorded */
    }
 
-   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT ||
-       ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+   /* Check read buffer's status (draw buffer was already checked) */
+   if (ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
       _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
                   "glCopyPixels(incomplete framebuffer)" );
       goto end;
@@ -251,19 +215,9 @@ _mesa_Bitmap( GLsizei width, GLsizei height,
       return;    /* do nothing */
    }
 
-   if (ctx->NewState) {
-      _mesa_update_state(ctx);
-   }
-
-   if (!valid_fragment_program(ctx)) {
-      _mesa_error(ctx, GL_INVALID_OPERATION,
-                  "glBitmap (invalid fragment program)");
-      return;
-   }
-
-   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
-      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
-                  "glBitmap(incomplete framebuffer)");
+   /* Note: this call does state validation */
+   if (!_mesa_valid_to_render(ctx, "glBitmap")) {
+      /* the error code was recorded */
       return;
    }
 
-- 
2.30.2