Make GL_ARB_draw_buffers mandatory

Signed-off-by: Ian Romanick <[email protected]>

30 files changed, 57 insertions, 41 deletions

diff --git a/src/mesa/drivers/dri/common/utils.c b/src/mesa/drivers/dri/common/utils.c
index 04d334f278b..e4d228c575e 100644
--- a/src/mesa/drivers/dri/common/utils.c
+++ b/src/mesa/drivers/dri/common/utils.c
@@ -179,6 +179,7 @@ driGetRendererString( char * buffer, const char * hardware_name,
 
 
 
+#define need_GL_ARB_draw_buffers
 #define need_GL_ARB_multisample
 #define need_GL_ARB_texture_compression
 #define need_GL_ARB_transpose_matrix
@@ -202,6 +203,7 @@ driGetRendererString( char * buffer, const char * hardware_name,
 #include "extension_helper.h"
 
 static const struct dri_extension all_mesa_extensions[] = {
+   { "GL_ARB_draw_buffers",          GL_ARB_draw_buffers_functions },
    { "GL_ARB_multisample",           GL_ARB_multisample_functions },
    { "GL_ARB_texture_compression",   GL_ARB_texture_compression_functions },
    { "GL_ARB_transpose_matrix",      GL_ARB_transpose_matrix_functions },
diff --git a/src/mesa/drivers/dri/ffb/ffb_xmesa.c b/src/mesa/drivers/dri/ffb/ffb_xmesa.c
index 679f8561d24..0cdbbd0ace5 100644
--- a/src/mesa/drivers/dri/ffb/ffb_xmesa.c
+++ b/src/mesa/drivers/dri/ffb/ffb_xmesa.c
@@ -260,6 +260,8 @@ ffbCreateContext(const __GLcontextModes *mesaVis,
 	ctx->Const.MaxLineWidthAA = 1.0;
 	ctx->Const.LineWidthGranularity = 1.0;
 
+	ctx->Const.MaxDrawBuffers = 1;
+
 	/* Instead of having GCC emit these constants a zillion times
 	 * everywhere in the driver, put them here.
 	 */
diff --git a/src/mesa/drivers/dri/gamma/gamma_context.c b/src/mesa/drivers/dri/gamma/gamma_context.c
index c91bedce3a8..b0ac299daae 100644
--- a/src/mesa/drivers/dri/gamma/gamma_context.c
+++ b/src/mesa/drivers/dri/gamma/gamma_context.c
@@ -133,6 +133,8 @@ GLboolean gammaCreateContext( const __GLcontextModes *glVisual,
    ctx->Const.MaxPointSizeAA = 16.0; 
    ctx->Const.PointSizeGranularity = 0.25;
 
+   ctx->Const.MaxDrawBuffers = 1;
+
    gmesa->texHeap = mmInit( 0, gmesa->gammaScreen->textureSize );
 
    make_empty_list(&gmesa->TexObjList);
diff --git a/src/mesa/drivers/dri/i915/i830_context.c b/src/mesa/drivers/dri/i915/i830_context.c
index 09b1ec922ff..fdce8af31f4 100644
--- a/src/mesa/drivers/dri/i915/i830_context.c
+++ b/src/mesa/drivers/dri/i915/i830_context.c
@@ -97,6 +97,8 @@ i830CreateContext(const __GLcontextModes * mesaVis,
    ctx->Const.MaxTextureRectSize = (1 << 11);
    ctx->Const.MaxTextureUnits = I830_TEX_UNITS;
 
+   ctx->Const.MaxDrawBuffers = 1;
+
    _tnl_init_vertices(ctx, ctx->Const.MaxArrayLockSize + 12,
                       18 * sizeof(GLfloat));
 
diff --git a/src/mesa/drivers/dri/i915/i915_context.c b/src/mesa/drivers/dri/i915/i915_context.c
index 3d6af38057e..c224c68b660 100644
--- a/src/mesa/drivers/dri/i915/i915_context.c
+++ b/src/mesa/drivers/dri/i915/i915_context.c
@@ -172,6 +172,8 @@ i915CreateContext(const __GLcontextModes * mesaVis,
 
    ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
 
+   ctx->Const.MaxDrawBuffers = 1;
+
    driInitExtensions(ctx, i915_extensions, GL_FALSE);
 
 
diff --git a/src/mesa/drivers/dri/intel/intel_extensions.c b/src/mesa/drivers/dri/intel/intel_extensions.c
index 549b239bd31..27d056a3b73 100644
--- a/src/mesa/drivers/dri/intel/intel_extensions.c
+++ b/src/mesa/drivers/dri/intel/intel_extensions.c
@@ -109,7 +109,6 @@ static const struct dri_extension card_extensions[] = {
 /** i965-only extensions */
 static const struct dri_extension brw_extensions[] = {
    { "GL_ARB_depth_texture",              NULL },
-   { "GL_ARB_draw_buffers",               NULL },
    { "GL_ARB_fragment_program",           NULL },
    { "GL_ARB_fragment_program_shadow",    NULL },
    { "GL_ARB_fragment_shader",            NULL },
diff --git a/src/mesa/drivers/dri/mach64/mach64_context.c b/src/mesa/drivers/dri/mach64/mach64_context.c
index 4edab846b06..9c7f513c6f5 100644
--- a/src/mesa/drivers/dri/mach64/mach64_context.c
+++ b/src/mesa/drivers/dri/mach64/mach64_context.c
@@ -190,6 +190,7 @@ GLboolean mach64CreateContext( const __GLcontextModes *glVisual,
    ctx->Const.MaxTextureUnits = 2;
    ctx->Const.MaxTextureImageUnits = 2;
    ctx->Const.MaxTextureCoordUnits = 2;
+   ctx->Const.MaxDrawBuffers = 1;
 
    heap = mach64Screen->IsPCI ? MACH64_CARD_HEAP : MACH64_AGP_HEAP;
 
diff --git a/src/mesa/drivers/dri/mga/mga_xmesa.c b/src/mesa/drivers/dri/mga/mga_xmesa.c
index 41fa9b29ffc..2d0f387cdc6 100644
--- a/src/mesa/drivers/dri/mga/mga_xmesa.c
+++ b/src/mesa/drivers/dri/mga/mga_xmesa.c
@@ -531,6 +531,8 @@ mgaCreateContext( const __GLcontextModes *mesaVis,
    ctx->Const.MaxLineWidthAA = 10.0;
    ctx->Const.LineWidthGranularity = 1.0;
 
+   ctx->Const.MaxDrawBuffers = 1;
+
    mmesa->texture_depth = driQueryOptioni (&mmesa->optionCache,
 					   "texture_depth");
    if (mmesa->texture_depth == DRI_CONF_TEXTURE_DEPTH_FB)
diff --git a/src/mesa/drivers/dri/r128/r128_context.c b/src/mesa/drivers/dri/r128/r128_context.c
index 4d6031f5273..f511a67bada 100644
--- a/src/mesa/drivers/dri/r128/r128_context.c
+++ b/src/mesa/drivers/dri/r128/r128_context.c
@@ -223,6 +223,8 @@ GLboolean r128CreateContext( const __GLcontextModes *glVisual,
    ctx->Const.MaxLineWidthAA = 1.0;
    ctx->Const.LineWidthGranularity = 1.0;
 
+   ctx->Const.MaxDrawBuffers = 1;
+
 #if ENABLE_PERF_BOXES
    rmesa->boxes = driQueryOptionb(&rmesa->optionCache, "performance_boxes");
 #endif
diff --git a/src/mesa/drivers/dri/r200/r200_context.c b/src/mesa/drivers/dri/r200/r200_context.c
index 47ecd4b05a1..c06751516eb 100644
--- a/src/mesa/drivers/dri/r200/r200_context.c
+++ b/src/mesa/drivers/dri/r200/r200_context.c
@@ -403,6 +403,8 @@ GLboolean r200CreateContext( const __GLcontextModes *glVisual,
    ctx->Const.VertexProgram.MaxNativeParameters = R200_VSF_MAX_PARAM;
    ctx->Const.VertexProgram.MaxNativeAddressRegs = 1;
 
+   ctx->Const.MaxDrawBuffers = 1;
+
    /* Initialize the software rasterizer and helper modules.
     */
    _swrast_CreateContext( ctx );
diff --git a/src/mesa/drivers/dri/r300/r300_context.c b/src/mesa/drivers/dri/r300/r300_context.c
index e74d29e5803..4c14c7eefed 100644
--- a/src/mesa/drivers/dri/r300/r300_context.c
+++ b/src/mesa/drivers/dri/r300/r300_context.c
@@ -311,6 +311,8 @@ GLboolean r300CreateContext(const __GLcontextModes * glVisual,
 #endif
 #endif
 
+	ctx->Const.MaxDrawBuffers = 1;
+
 	/* Initialize the software rasterizer and helper modules.
 	 */
 	_swrast_CreateContext(ctx);
diff --git a/src/mesa/drivers/dri/radeon/radeon_context.c b/src/mesa/drivers/dri/radeon/radeon_context.c
index 38066134a96..ea81a3250b7 100644
--- a/src/mesa/drivers/dri/radeon/radeon_context.c
+++ b/src/mesa/drivers/dri/radeon/radeon_context.c
@@ -353,6 +353,8 @@ radeonCreateContext( const __GLcontextModes *glVisual,
 
    rmesa->boxes = 0;
 
+   ctx->Const.MaxDrawBuffers = 1;
+
    /* Initialize the software rasterizer and helper modules.
     */
    _swrast_CreateContext( ctx );
diff --git a/src/mesa/drivers/dri/s3v/s3v_context.c b/src/mesa/drivers/dri/s3v/s3v_context.c
index 14502f95aec..0a3bf7258d1 100644
--- a/src/mesa/drivers/dri/s3v/s3v_context.c
+++ b/src/mesa/drivers/dri/s3v/s3v_context.c
@@ -108,6 +108,8 @@ GLboolean s3vCreateContext(const __GLcontextModes *glVisual,
 	ctx->Const.MaxLineWidthAA = 1.0;
 	ctx->Const.LineWidthGranularity = 1.0;
 
+	ctx->Const.MaxDrawBuffers = 1;
+
 	vmesa->texHeap = mmInit( 0, vmesa->s3vScreen->textureSize );
 	DEBUG(("vmesa->s3vScreen->textureSize = 0x%x\n",
 		vmesa->s3vScreen->textureSize));
diff --git a/src/mesa/drivers/dri/savage/savage_xmesa.c b/src/mesa/drivers/dri/savage/savage_xmesa.c
index ab21505cbd7..c5decb093af 100644
--- a/src/mesa/drivers/dri/savage/savage_xmesa.c
+++ b/src/mesa/drivers/dri/savage/savage_xmesa.c
@@ -344,7 +344,9 @@ savageCreateContext( const __GLcontextModes *mesaVis,
    ctx->Const.MaxLineWidthAA = 3.0;
    ctx->Const.LineWidthGranularity = 1.0;
 #endif
-   
+
+   ctx->Const.MaxDrawBuffers = 1;
+
    /* Dri stuff
     */
    imesa->hHWContext = driContextPriv->hHWContext;
diff --git a/src/mesa/drivers/dri/tdfx/tdfx_context.c b/src/mesa/drivers/dri/tdfx/tdfx_context.c
index aeb267a64a2..20046fcb3af 100644
--- a/src/mesa/drivers/dri/tdfx/tdfx_context.c
+++ b/src/mesa/drivers/dri/tdfx/tdfx_context.c
@@ -309,6 +309,8 @@ GLboolean tdfxCreateContext( const __GLcontextModes *mesaVis,
    ctx->Const.MaxLineWidthAA = 1.0;
    ctx->Const.LineWidthGranularity = 1.0;
 
+   ctx->Const.MaxDrawBuffers = 1;
+
    /* Initialize the software rasterizer and helper modules.
     */
    _swrast_CreateContext( ctx );
diff --git a/src/mesa/drivers/dri/trident/trident_context.c b/src/mesa/drivers/dri/trident/trident_context.c
index e134cfcf8e9..aefd8a243f6 100644
--- a/src/mesa/drivers/dri/trident/trident_context.c
+++ b/src/mesa/drivers/dri/trident/trident_context.c
@@ -128,6 +128,8 @@ tridentCreateContext( const __GLcontextModes *glVisual,
    ctx->Const.MaxPointSizeAA = 16.0; 
    ctx->Const.PointSizeGranularity = 0.25;
 
+   ctx->Const.MaxDrawBuffers = 1;
+
 #if 0
    tmesa->texHeap = mmInit( 0, tmesa->tridentScreen->textureSize );
 
diff --git a/src/mesa/drivers/dri/unichrome/via_context.c b/src/mesa/drivers/dri/unichrome/via_context.c
index cb66c2d89d7..6eb19ac0790 100644
--- a/src/mesa/drivers/dri/unichrome/via_context.c
+++ b/src/mesa/drivers/dri/unichrome/via_context.c
@@ -573,6 +573,8 @@ viaCreateContext(const __GLcontextModes *visual,
     ctx->Const.MaxPointSizeAA = 1.0;
     ctx->Const.PointSizeGranularity = 1.0;
 
+    ctx->Const.MaxDrawBuffers = 1;
+
     ctx->Driver.GetString = viaGetString;
 
     ctx->DriverCtx = (void *)vmesa;
diff --git a/src/mesa/drivers/glide/fxdd.c b/src/mesa/drivers/glide/fxdd.c
index e93ada28931..338cd37382a 100644
--- a/src/mesa/drivers/glide/fxdd.c
+++ b/src/mesa/drivers/glide/fxdd.c
@@ -1773,6 +1773,8 @@ fxDDInitFxMesaContext(fxMesaContext fxMesa)
    ctx->Const.MaxTextureImageUnits = fxMesa->haveTwoTMUs ? 2 : 1;
    ctx->Const.MaxTextureUnits = MAX2(ctx->Const.MaxTextureImageUnits, ctx->Const.MaxTextureCoordUnits);
 
+   ctx->Const.MaxDrawBuffers = 1;
+
    fxMesa->new_state = _NEW_ALL;
    if (!fxMesa->haveHwStencil) {
       /* don't touch stencil if there is none */
diff --git a/src/mesa/drivers/windows/gldirect/dglcontext.c b/src/mesa/drivers/windows/gldirect/dglcontext.c
index 4ad7a76e67f..e9c23d1ccb0 100644
--- a/src/mesa/drivers/windows/gldirect/dglcontext.c
+++ b/src/mesa/drivers/windows/gldirect/dglcontext.c
@@ -1482,6 +1482,7 @@ SkipPrimaryCreate:
 #else
 	lpCtx->glCtx->Const.MaxTextureSize = 1024;
 #endif
+	lpCtx->glCtx->Const.MaxDrawBuffers = 1;
 
 	// Setup the Display Driver pointers
 	dglSetupDDPointers(lpCtx->glCtx);
diff --git a/src/mesa/drivers/windows/gldirect/dx7/gld_wgl_dx7.c b/src/mesa/drivers/windows/gldirect/dx7/gld_wgl_dx7.c
index 0f8fe33eb15..fa44a952a09 100644
--- a/src/mesa/drivers/windows/gldirect/dx7/gld_wgl_dx7.c
+++ b/src/mesa/drivers/windows/gldirect/dx7/gld_wgl_dx7.c
@@ -1422,6 +1422,8 @@ BOOL gldInitialiseMesa_DX(
 		lpCtx->glCtx->Const.MaxTextureUnits = 1;
 	}
 
+	lpCtx->glCtx->Const.MaxDrawBuffers = 1;
+
 	// max texture size
 //	MaxTextureSize = min(gld->d3dCaps8.MaxTextureHeight, gld->d3dCaps8.MaxTextureWidth);
 	MaxTextureSize = min(gld->d3dCaps.dwMaxTextureHeight, gld->d3dCaps.dwMaxTextureWidth);
diff --git a/src/mesa/drivers/windows/gldirect/dx8/gld_wgl_dx8.c b/src/mesa/drivers/windows/gldirect/dx8/gld_wgl_dx8.c
index 690f68b68f1..011d810e975 100644
--- a/src/mesa/drivers/windows/gldirect/dx8/gld_wgl_dx8.c
+++ b/src/mesa/drivers/windows/gldirect/dx8/gld_wgl_dx8.c
@@ -1204,6 +1204,7 @@ BOOL gldInitialiseMesa_DX(
 		MaxTextureSize >>= 1;
 	}
 	lpCtx->glCtx->Const.MaxTextureLevels = (TextureLevels) ? TextureLevels : 8;
+	lpCtx->glCtx->Const.MaxDrawBuffers = 1;
 
 	IDirect3DDevice8_SetRenderState(gld->pDev, D3DRS_LIGHTING, FALSE);
 	IDirect3DDevice8_SetRenderState(gld->pDev, D3DRS_CULLMODE, D3DCULL_NONE);
diff --git a/src/mesa/drivers/windows/gldirect/dx9/gld_wgl_dx9.c b/src/mesa/drivers/windows/gldirect/dx9/gld_wgl_dx9.c
index dc465c54185..a03b865bb44 100644
--- a/src/mesa/drivers/windows/gldirect/dx9/gld_wgl_dx9.c
+++ b/src/mesa/drivers/windows/gldirect/dx9/gld_wgl_dx9.c
@@ -1206,6 +1206,7 @@ BOOL gldInitialiseMesa_DX(
 		MaxTextureSize >>= 1;
 	}
 	lpCtx->glCtx->Const.MaxTextureLevels = (TextureLevels) ? TextureLevels : 8;
+	lpCtx->glCtx->Const.MaxDrawBuffers = 1;
 
 	IDirect3DDevice9_SetRenderState(gld->pDev, D3DRS_LIGHTING, FALSE);
 	IDirect3DDevice9_SetRenderState(gld->pDev, D3DRS_CULLMODE, D3DCULL_NONE);
diff --git a/src/mesa/drivers/windows/gldirect/mesasw/gld_wgl_mesasw.c b/src/mesa/drivers/windows/gldirect/mesasw/gld_wgl_mesasw.c
index b590dc795a0..342a742867a 100644
--- a/src/mesa/drivers/windows/gldirect/mesasw/gld_wgl_mesasw.c
+++ b/src/mesa/drivers/windows/gldirect/mesasw/gld_wgl_mesasw.c
@@ -1625,6 +1625,7 @@ BOOL gldInitialiseMesa_MesaSW(
 
 	// Added this to force max texture diminsion to 256. KeithH
 	ctx->Const.MaxTextureLevels = 8;
+	ctx->Const.MaxDrawBuffers = 1;
 
 	_mesa_enable_sw_extensions(ctx);
 	_mesa_enable_imaging_extensions(ctx);
diff --git a/src/mesa/main/attrib.c b/src/mesa/main/attrib.c
index 36586758a4f..98173cf7862 100644
--- a/src/mesa/main/attrib.c
+++ b/src/mesa/main/attrib.c
@@ -903,14 +903,13 @@ _mesa_PopAttrib(void)
                    * function, but legal for the later.
                    */
                   GLboolean multipleBuffers = GL_FALSE;
-                  if (ctx->Extensions.ARB_draw_buffers) {
-                     GLuint i;
-                     for (i = 1; i < ctx->Const.MaxDrawBuffers; i++) {
-                        if (color->DrawBuffer[i] != GL_NONE) {
-                           multipleBuffers = GL_TRUE;
-                           break;
-                        }
-                     }
+		  GLuint i;
+
+		  for (i = 1; i < ctx->Const.MaxDrawBuffers; i++) {
+		     if (color->DrawBuffer[i] != GL_NONE) {
+			multipleBuffers = GL_TRUE;
+			break;
+		     }
                   }
                   /* Call the API_level functions, not _mesa_drawbuffers()
                    * since we need to do error checking on the pop'd
diff --git a/src/mesa/main/buffers.c b/src/mesa/main/buffers.c
index b23d2f612bf..dc415c4f20c 100644
--- a/src/mesa/main/buffers.c
+++ b/src/mesa/main/buffers.c
@@ -289,10 +289,6 @@ _mesa_DrawBuffersARB(GLsizei n, const GLenum *buffers)
    GET_CURRENT_CONTEXT(ctx);
    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 
-   if (!ctx->Extensions.ARB_draw_buffers) {
-      _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffersARB");
-      return;
-   }
    if (n < 1 || n > (GLsizei) ctx->Const.MaxDrawBuffers) {
       _mesa_error(ctx, GL_INVALID_VALUE, "glDrawBuffersARB(n)");
       return;
diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c
index ec6ba708002..8c9208af70c 100644
--- a/src/mesa/main/extensions.c
+++ b/src/mesa/main/extensions.c
@@ -45,7 +45,7 @@ static const struct {
    int flag_offset;
 } default_extensions[] = {
    { OFF, "GL_ARB_depth_texture",              F(ARB_depth_texture) },
-   { OFF, "GL_ARB_draw_buffers",               F(ARB_draw_buffers) },
+   { ON,  "GL_ARB_draw_buffers",               F(ARB_draw_buffers) },
    { OFF, "GL_ARB_fragment_program",           F(ARB_fragment_program) },
    { OFF, "GL_ARB_fragment_program_shadow",    F(ARB_fragment_program_shadow) },
    { OFF, "GL_ARB_fragment_shader",            F(ARB_fragment_shader) },
@@ -184,7 +184,7 @@ void
 _mesa_enable_sw_extensions(GLcontext *ctx)
 {
    ctx->Extensions.ARB_depth_texture = GL_TRUE;
-   ctx->Extensions.ARB_draw_buffers = GL_TRUE;
+   /*ctx->Extensions.ARB_draw_buffers = GL_TRUE;*/
 #if FEATURE_ARB_fragment_program
    ctx->Extensions.ARB_fragment_program = GL_TRUE;
    ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
@@ -401,7 +401,7 @@ _mesa_enable_1_5_extensions(GLcontext *ctx)
 void
 _mesa_enable_2_0_extensions(GLcontext *ctx)
 {
-   ctx->Extensions.ARB_draw_buffers = GL_TRUE;
+   /*ctx->Extensions.ARB_draw_buffers = GL_TRUE;*/
 #if FEATURE_ARB_fragment_shader
    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 #endif
diff --git a/src/mesa/main/get.c b/src/mesa/main/get.c
index 613f067caa3..8e04ab9b9db 100644
--- a/src/mesa/main/get.c
+++ b/src/mesa/main/get.c
@@ -1732,15 +1732,12 @@ _mesa_GetBooleanv( GLenum pname, GLboolean *params )
          params[0] = INT_TO_BOOLEAN(ctx->VertexProgram.CurrentPosition);
          break;
       case GL_MAX_DRAW_BUFFERS_ARB:
-         CHECK_EXT1(ARB_draw_buffers, "GetBooleanv");
          params[0] = INT_TO_BOOLEAN(ctx->Const.MaxDrawBuffers);
          break;
       case GL_DRAW_BUFFER0_ARB:
-         CHECK_EXT1(ARB_draw_buffers, "GetBooleanv");
          params[0] = ENUM_TO_BOOLEAN(ctx->DrawBuffer->ColorDrawBuffer[0]);
          break;
       case GL_DRAW_BUFFER1_ARB:
-         CHECK_EXT1(ARB_draw_buffers, "GetBooleanv");
          {
          GLenum buffer;
          if (pname - GL_DRAW_BUFFER0_ARB >= ctx->Const.MaxDrawBuffers) {
@@ -1752,7 +1749,6 @@ _mesa_GetBooleanv( GLenum pname, GLboolean *params )
          }
          break;
       case GL_DRAW_BUFFER2_ARB:
-         CHECK_EXT1(ARB_draw_buffers, "GetBooleanv");
          {
          GLenum buffer;
          if (pname - GL_DRAW_BUFFER0_ARB >= ctx->Const.MaxDrawBuffers) {
@@ -1764,7 +1760,6 @@ _mesa_GetBooleanv( GLenum pname, GLboolean *params )
          }
          break;
       case GL_DRAW_BUFFER3_ARB:
-         CHECK_EXT1(ARB_draw_buffers, "GetBooleanv");
          {
          GLenum buffer;
          if (pname - GL_DRAW_BUFFER0_ARB >= ctx->Const.MaxDrawBuffers) {
@@ -3563,15 +3558,12 @@ _mesa_GetFloatv( GLenum pname, GLfloat *params )
          params[0] = (GLfloat)(ctx->VertexProgram.CurrentPosition);
          break;
       case GL_MAX_DRAW_BUFFERS_ARB:
-         CHECK_EXT1(ARB_draw_buffers, "GetFloatv");
          params[0] = (GLfloat)(ctx->Const.MaxDrawBuffers);
          break;
       case GL_DRAW_BUFFER0_ARB:
-         CHECK_EXT1(ARB_draw_buffers, "GetFloatv");
          params[0] = ENUM_TO_FLOAT(ctx->DrawBuffer->ColorDrawBuffer[0]);
          break;
       case GL_DRAW_BUFFER1_ARB:
-         CHECK_EXT1(ARB_draw_buffers, "GetFloatv");
          {
          GLenum buffer;
          if (pname - GL_DRAW_BUFFER0_ARB >= ctx->Const.MaxDrawBuffers) {
@@ -3583,7 +3575,6 @@ _mesa_GetFloatv( GLenum pname, GLfloat *params )
          }
          break;
       case GL_DRAW_BUFFER2_ARB:
-         CHECK_EXT1(ARB_draw_buffers, "GetFloatv");
          {
          GLenum buffer;
          if (pname - GL_DRAW_BUFFER0_ARB >= ctx->Const.MaxDrawBuffers) {
@@ -3595,7 +3586,6 @@ _mesa_GetFloatv( GLenum pname, GLfloat *params )
          }
          break;
       case GL_DRAW_BUFFER3_ARB:
-         CHECK_EXT1(ARB_draw_buffers, "GetFloatv");
          {
          GLenum buffer;
          if (pname - GL_DRAW_BUFFER0_ARB >= ctx->Const.MaxDrawBuffers) {
@@ -5394,15 +5384,12 @@ _mesa_GetIntegerv( GLenum pname, GLint *params )
          params[0] = ctx->VertexProgram.CurrentPosition;
          break;
       case GL_MAX_DRAW_BUFFERS_ARB:
-         CHECK_EXT1(ARB_draw_buffers, "GetIntegerv");
          params[0] = ctx->Const.MaxDrawBuffers;
          break;
       case GL_DRAW_BUFFER0_ARB:
-         CHECK_EXT1(ARB_draw_buffers, "GetIntegerv");
          params[0] = ENUM_TO_INT(ctx->DrawBuffer->ColorDrawBuffer[0]);
          break;
       case GL_DRAW_BUFFER1_ARB:
-         CHECK_EXT1(ARB_draw_buffers, "GetIntegerv");
          {
          GLenum buffer;
          if (pname - GL_DRAW_BUFFER0_ARB >= ctx->Const.MaxDrawBuffers) {
@@ -5414,7 +5401,6 @@ _mesa_GetIntegerv( GLenum pname, GLint *params )
          }
          break;
       case GL_DRAW_BUFFER2_ARB:
-         CHECK_EXT1(ARB_draw_buffers, "GetIntegerv");
          {
          GLenum buffer;
          if (pname - GL_DRAW_BUFFER0_ARB >= ctx->Const.MaxDrawBuffers) {
@@ -5426,7 +5412,6 @@ _mesa_GetIntegerv( GLenum pname, GLint *params )
          }
          break;
       case GL_DRAW_BUFFER3_ARB:
-         CHECK_EXT1(ARB_draw_buffers, "GetIntegerv");
          {
          GLenum buffer;
          if (pname - GL_DRAW_BUFFER0_ARB >= ctx->Const.MaxDrawBuffers) {
diff --git a/src/mesa/main/get_gen.py b/src/mesa/main/get_gen.py
index 78ccee90190..83a8f2f786c 100644
--- a/src/mesa/main/get_gen.py
+++ b/src/mesa/main/get_gen.py
@@ -914,9 +914,9 @@ StateVars = [
 
 	# GL_ARB_draw_buffers
 	( "GL_MAX_DRAW_BUFFERS_ARB", GLint,
-	  ["ctx->Const.MaxDrawBuffers"], "", ["ARB_draw_buffers"] ),
+	  ["ctx->Const.MaxDrawBuffers"], "", None ),
 	( "GL_DRAW_BUFFER0_ARB", GLenum,
-	  ["ctx->DrawBuffer->ColorDrawBuffer[0]"], "", ["ARB_draw_buffers"] ),
+	  ["ctx->DrawBuffer->ColorDrawBuffer[0]"], "", None ),
 	( "GL_DRAW_BUFFER1_ARB", GLenum,
 	  ["buffer"],
 	  """GLenum buffer;
@@ -924,7 +924,7 @@ StateVars = [
             _mesa_error(ctx, GL_INVALID_ENUM, "glGet(GL_DRAW_BUFFERx_ARB)");
             return;
          }
-         buffer = ctx->DrawBuffer->ColorDrawBuffer[1];""", ["ARB_draw_buffers"] ),
+         buffer = ctx->DrawBuffer->ColorDrawBuffer[1];""", None ),
 	( "GL_DRAW_BUFFER2_ARB", GLenum,
 	  ["buffer"],
 	  """GLenum buffer;
@@ -932,7 +932,7 @@ StateVars = [
             _mesa_error(ctx, GL_INVALID_ENUM, "glGet(GL_DRAW_BUFFERx_ARB)");
             return;
          }
-         buffer = ctx->DrawBuffer->ColorDrawBuffer[2];""", ["ARB_draw_buffers"] ),
+         buffer = ctx->DrawBuffer->ColorDrawBuffer[2];""", None ),
 	( "GL_DRAW_BUFFER3_ARB", GLenum,
 	  ["buffer"],
 	  """GLenum buffer;
@@ -940,7 +940,7 @@ StateVars = [
             _mesa_error(ctx, GL_INVALID_ENUM, "glGet(GL_DRAW_BUFFERx_ARB)");
             return;
          }
-         buffer = ctx->DrawBuffer->ColorDrawBuffer[3];""", ["ARB_draw_buffers"] ),
+         buffer = ctx->DrawBuffer->ColorDrawBuffer[3];""", None ),
 	# XXX Add more GL_DRAW_BUFFERn_ARB entries as needed in the future
 
 	# GL_OES_read_format
diff --git a/src/mesa/shader/arbprogparse.c b/src/mesa/shader/arbprogparse.c
index a3a75c3b0a6..c65d886a91d 100644
--- a/src/mesa/shader/arbprogparse.c
+++ b/src/mesa/shader/arbprogparse.c
@@ -3616,8 +3616,7 @@ enable_parser_extensions(GLcontext *ctx, grammar id)
    if (ctx->Extensions.NV_texture_rectangle
        && !enable_ext(ctx, id, "texture_rectangle"))
       return GL_FALSE;
-   if (ctx->Extensions.ARB_draw_buffers
-       && !enable_ext(ctx, id, "draw_buffers"))
+   if (!enable_ext(ctx, id, "draw_buffers"))
       return GL_FALSE;
    if (ctx->Extensions.MESA_texture_array
        && !enable_ext(ctx, id, "texture_array"))
diff --git a/src/mesa/shader/slang/slang_preprocess.c b/src/mesa/shader/slang/slang_preprocess.c
index cd79c8b94a6..89aaa3a6213 100644
--- a/src/mesa/shader/slang/slang_preprocess.c
+++ b/src/mesa/shader/slang/slang_preprocess.c
@@ -508,8 +508,7 @@ static GLvoid
 pp_ext_init(pp_ext *self, const struct gl_extensions *extensions)
 {
    pp_ext_disable_all (self);
-   if (extensions->ARB_draw_buffers)
-      self->ARB_draw_buffers = GL_TRUE;
+   self->ARB_draw_buffers = GL_TRUE;
    if (extensions->NV_texture_rectangle)
       self->ARB_texture_rectangle = GL_TRUE;
 }