dri: add a way to request that modes have matching color/zs depths

Some GPUs, notably nv3x/nv4x can't render to mismatched color/zs
framebuffer depths. Fallbacks can be done by the driver, with shadow
surfaces, but no reason to encourage applications to select non-matching
glx visuals.

Signed-off-by: Ilia Mirkin <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>

7 files changed, 27 insertions, 12 deletions

diff --git a/src/mesa/drivers/dri/common/utils.c b/src/mesa/drivers/dri/common/utils.c
index 4b2e89c6ae3..c37d446a1e4 100644
--- a/src/mesa/drivers/dri/common/utils.c
+++ b/src/mesa/drivers/dri/common/utils.c
@@ -143,8 +143,10 @@ driGetRendererString( char * buffer, const char * hardware_name,
  * \param msaa_samples  Array of msaa sample count. 0 represents a visual
  *                      without a multisample buffer.
  * \param num_msaa_modes Number of entries in \c msaa_samples.
- * \param visType       GLX visual type.  Usually either \c GLX_TRUE_COLOR or
- *                      \c GLX_DIRECT_COLOR.
+ * \param enable_accum  Add an accum buffer to the configs
+ * \param color_depth_match Whether the color depth must match the zs depth
+ *                          This forces 32-bit color to have 24-bit depth, and
+ *                          16-bit color to have 16-bit depth.
  * 
  * \returns
  * Pointer to any array of pointers to the \c __DRIconfig structures created
@@ -158,7 +160,7 @@ driCreateConfigs(mesa_format format,
 		 unsigned num_depth_stencil_bits,
 		 const GLenum * db_modes, unsigned num_db_modes,
 		 const uint8_t * msaa_samples, unsigned num_msaa_modes,
-		 GLboolean enable_accum)
+		 GLboolean enable_accum, GLboolean color_depth_match)
 {
    static const uint32_t masks_table[][4] = {
       /* MESA_FORMAT_B5G6R5_UNORM */
@@ -236,6 +238,19 @@ driCreateConfigs(mesa_format format,
 	for ( i = 0 ; i < num_db_modes ; i++ ) {
 	    for ( h = 0 ; h < num_msaa_modes; h++ ) {
 	    	for ( j = 0 ; j < num_accum_bits ; j++ ) {
+		    if (color_depth_match &&
+			(depth_bits[k] || stencil_bits[k])) {
+			/* Depth can really only be 0, 16, 24, or 32. A 32-bit
+			 * color format still matches 24-bit depth, as there
+			 * is an implicit 8-bit stencil. So really we just
+			 * need to make sure that color/depth are both 16 or
+			 * both non-16.
+			 */
+			if ((depth_bits[k] + stencil_bits[k] == 16) !=
+			    (red_bits + green_bits + blue_bits + alpha_bits == 16))
+			    continue;
+		    }
+
 		    *c = malloc (sizeof **c);
 		    modes = &(*c)->modes;
 		    c++;
diff --git a/src/mesa/drivers/dri/common/utils.h b/src/mesa/drivers/dri/common/utils.h
index f6b8d7c3a21..7be0465c261 100644
--- a/src/mesa/drivers/dri/common/utils.h
+++ b/src/mesa/drivers/dri/common/utils.h
@@ -45,7 +45,7 @@ driCreateConfigs(mesa_format format,
 		 unsigned num_depth_stencil_bits,
 		 const GLenum * db_modes, unsigned num_db_modes,
 		 const uint8_t * msaa_samples, unsigned num_msaa_modes,
-		 GLboolean enable_accum);
+		 GLboolean enable_accum, GLboolean color_depth_match);
 
 __DRIconfig **driConcatConfigs(__DRIconfig **a,
 			       __DRIconfig **b);
diff --git a/src/mesa/drivers/dri/i915/intel_screen.c b/src/mesa/drivers/dri/i915/intel_screen.c
index 77af328bfed..77f03fa8d79 100644
--- a/src/mesa/drivers/dri/i915/intel_screen.c
+++ b/src/mesa/drivers/dri/i915/intel_screen.c
@@ -1081,7 +1081,7 @@ intel_screen_make_configs(__DRIscreen *dri_screen)
                                      num_depth_stencil_bits,
                                      back_buffer_modes, 2,
                                      singlesample_samples, 1,
-                                     false);
+                                     false, false);
       configs = driConcatConfigs(configs, new_configs);
    }
 
@@ -1103,7 +1103,7 @@ intel_screen_make_configs(__DRIscreen *dri_screen)
                                      depth_bits, stencil_bits, 1,
                                      back_buffer_modes, 1,
                                      singlesample_samples, 1,
-                                     true);
+                                     true, false);
       configs = driConcatConfigs(configs, new_configs);
    }
 
diff --git a/src/mesa/drivers/dri/i965/intel_screen.c b/src/mesa/drivers/dri/i965/intel_screen.c
index ae51c40c2b7..9df888df448 100644
--- a/src/mesa/drivers/dri/i965/intel_screen.c
+++ b/src/mesa/drivers/dri/i965/intel_screen.c
@@ -1328,7 +1328,7 @@ intel_screen_make_configs(__DRIscreen *dri_screen)
                                      num_depth_stencil_bits,
                                      back_buffer_modes, 2,
                                      singlesample_samples, 1,
-                                     false);
+                                     false, false);
       configs = driConcatConfigs(configs, new_configs);
    }
 
@@ -1350,7 +1350,7 @@ intel_screen_make_configs(__DRIscreen *dri_screen)
                                      depth_bits, stencil_bits, 1,
                                      back_buffer_modes, 1,
                                      singlesample_samples, 1,
-                                     true);
+                                     true, false);
       configs = driConcatConfigs(configs, new_configs);
    }
 
@@ -1398,7 +1398,7 @@ intel_screen_make_configs(__DRIscreen *dri_screen)
                                      back_buffer_modes, 1,
                                      multisample_samples,
                                      num_msaa_modes,
-                                     false);
+                                     false, false);
       configs = driConcatConfigs(configs, new_configs);
    }
 
diff --git a/src/mesa/drivers/dri/nouveau/nouveau_screen.c b/src/mesa/drivers/dri/nouveau/nouveau_screen.c
index 6f61f66f3b0..0545e68cbe1 100644
--- a/src/mesa/drivers/dri/nouveau/nouveau_screen.c
+++ b/src/mesa/drivers/dri/nouveau/nouveau_screen.c
@@ -78,7 +78,7 @@ nouveau_get_configs(void)
 					  ARRAY_SIZE(back_buffer_modes),
 					  msaa_samples,
 					  ARRAY_SIZE(msaa_samples),
-					  GL_TRUE);
+					  GL_TRUE, GL_FALSE);
 		assert(config);
 
 		configs = driConcatConfigs(configs, config);
diff --git a/src/mesa/drivers/dri/radeon/radeon_screen.c b/src/mesa/drivers/dri/radeon/radeon_screen.c
index 98b4741b456..9a075351558 100644
--- a/src/mesa/drivers/dri/radeon/radeon_screen.c
+++ b/src/mesa/drivers/dri/radeon/radeon_screen.c
@@ -813,7 +813,7 @@ __DRIconfig **radeonInitScreen2(__DRIscreen *psp)
 				     ARRAY_SIZE(back_buffer_modes),
 				     msaa_samples_array,
 				     ARRAY_SIZE(msaa_samples_array),
-				     GL_TRUE);
+				     GL_TRUE, GL_FALSE);
       configs = driConcatConfigs(configs, new_configs);
    }
 
diff --git a/src/mesa/drivers/dri/swrast/swrast.c b/src/mesa/drivers/dri/swrast/swrast.c
index 2d4bb702fc2..6d3b00bd465 100644
--- a/src/mesa/drivers/dri/swrast/swrast.c
+++ b/src/mesa/drivers/dri/swrast/swrast.c
@@ -273,7 +273,7 @@ swrastFillInModes(__DRIscreen *psp,
 			       depth_bits_array, stencil_bits_array,
 			       depth_buffer_factor, back_buffer_modes,
 			       back_buffer_factor, msaa_samples_array, 1,
-			       GL_TRUE);
+			       GL_TRUE, GL_FALSE);
     if (configs == NULL) {
 	fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 		__LINE__);