i965: Add support for NV_conditional_render.

Since we lack hardware support for it, this is a simple matter of
checking _mesa_check_conditional_render at the entrypoints, and
suppressing it for the metaops where it doesn't apply.

Reviewed-by: Brian Paul <brianp@vmware.com>

docs/GL3.txt

@@ -13,7 +13,7 @@ Feature                                               Status
 GL 3.0:
 
 GLSL 1.30 (GL_EXT_gpu_shader4, etc.)                  started
-Conditional rendering (GL_NV_conditional_render)      DONE (swrast & softpipe)
+Conditional rendering (GL_NV_conditional_render)      DONE (swrast, softpipe, i965)
 Map buffer subranges (GL_ARB_map_buffer_range)        DONE
 Clamping controls (GL_ARB_color_buffer_float)         DONE
 Float textures, renderbuffers (GL_ARB_texture_float)  DONE (gallium r300)

docs/relnotes-7.11.html

@@ -51,6 +51,7 @@ tbd
 <li>GL_ATI_draw_buffers (all drivers)
 <li>GL_ATI_texture_compression_3dc (gallium drivers, swrast)
 <li>GL_ATI_texture_float (gallium, i965)
+<li>GL_NV_conditional_render (i965)
 <li>GL_NV_texture_barrier (gallium drivers)
 </ul>
 

src/mesa/drivers/dri/i965/brw_draw.c

@@ -28,6 +28,7 @@
 
 #include "main/glheader.h"
 #include "main/context.h"
+#include "main/condrender.h"
 #include "main/state.h"
 #include "main/enums.h"
 #include "tnl/tnl.h"
@@ -438,6 +439,9 @@ void brw_draw_prims( struct gl_context *ctx,
 {
    GLboolean retval;
 
+   if (!_mesa_check_conditional_render(ctx))
+      return;
+
    if (!vbo_all_varyings_in_vbos(arrays)) {
       if (!index_bounds_valid)
 	 vbo_get_minmax_index(ctx, prim, ib, &min_index, &max_index);

src/mesa/drivers/dri/intel/intel_clear.c

@@ -28,6 +28,7 @@
 
 #include "main/glheader.h"
 #include "main/mtypes.h"
+#include "main/condrender.h"
 #include "swrast/swrast.h"
 #include "drivers/common/meta.h"
 
@@ -88,6 +89,9 @@ intelClear(struct gl_context *ctx, GLbitfield mask)
    struct intel_renderbuffer *irb;
    int i;
 
+   if (!_mesa_check_conditional_render(ctx))
+      return;
+
    if (mask & (BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_FRONT_RIGHT)) {
       intel->front_buffer_dirty = GL_TRUE;
    }

src/mesa/drivers/dri/intel/intel_extensions.c

@@ -190,6 +190,7 @@ static const struct dri_extension brw_extensions[] = {
    { "GL_ATI_envmap_bumpmap",             GL_ATI_envmap_bumpmap_functions },
    { "GL_ATI_separate_stencil",           GL_ATI_separate_stencil_functions },
    { "GL_ATI_texture_env_combine3",       NULL },
+   { "GL_NV_conditional_render",          NULL },
    { "GL_NV_texture_env_combine4",        NULL },
    { NULL,                                NULL }
 };

src/mesa/drivers/dri/intel/intel_pixel_bitmap.c

@@ -29,6 +29,7 @@
 #include "main/enums.h"
 #include "main/image.h"
 #include "main/colormac.h"
+#include "main/condrender.h"
 #include "main/mtypes.h"
 #include "main/macros.h"
 #include "main/pbo.h"
@@ -329,6 +330,9 @@ intelBitmap(struct gl_context * ctx,
 {
    struct intel_context *intel = intel_context(ctx);
 
+   if (!_mesa_check_conditional_render(ctx))
+      return;
+
    if (do_blit_bitmap(ctx, x, y, width, height,
                           unpack, pixels))
       return;

src/mesa/drivers/dri/intel/intel_pixel_copy.c

@@ -29,6 +29,7 @@
 #include "main/image.h"
 #include "main/state.h"
 #include "main/mtypes.h"
+#include "main/condrender.h"
 #include "drivers/common/meta.h"
 
 #include "intel_context.h"
@@ -204,6 +205,9 @@ intelCopyPixels(struct gl_context * ctx,
 {
    DBG("%s\n", __FUNCTION__);
 
+   if (!_mesa_check_conditional_render(ctx))
+      return;
+
    if (do_blit_copypixels(ctx, srcx, srcy, width, height, destx, desty, type))
       return;