gallium: add a cap to expose whether driver supports mixed color/zs bits

Some hardware can't render to color/depth buffers of mixed bitness. When
that happens a fallback has to happen, but this allows the driver to
express that this isn't an optimal scenario. The purpose of this is to
remove such fbconfigs from the GLX/EGL config list.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/gallium/docs/source/screen.rst

@@ -347,6 +347,12 @@ The integer capabilities:
   for ``pipe_rasterizer_state::offset_units_unscaled``.
 * ``PIPE_CAP_VIEWPORT_SUBPIXEL_BITS``: Number of bits of subpixel precision for
   floating point viewport bounds.
+* ``PIPE_CAP_MIXED_COLOR_DEPTH_BITS``: Whether there is non-fallback
+  support for color/depth format combinations that use a different
+  number of bits. For the purpose of this cap, Z24 is treated as
+  32-bit. If set to off, that means that a B5G6R5 + Z24 or RGBA8 + Z16
+  combination will require a driver fallback, and should not be
+  advertised in the GLX/EGL config list.
 
 
 .. _pipe_capf:

src/gallium/drivers/freedreno/freedreno_screen.c

@@ -175,6 +175,7 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	case PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT:
 	case PIPE_CAP_VERTEXID_NOBASE:
 	case PIPE_CAP_STRING_MARKER:
+	case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
 		return 1;
 
 	case PIPE_CAP_USER_CONSTANT_BUFFERS:

src/gallium/drivers/i915/i915_screen.c

@@ -201,6 +201,7 @@ i915_get_param(struct pipe_screen *screen, enum pipe_cap cap)
    case PIPE_CAP_USER_VERTEX_BUFFERS:
    case PIPE_CAP_USER_INDEX_BUFFERS:
    case PIPE_CAP_USER_CONSTANT_BUFFERS:
+   case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
       return 1;
 
    /* Unsupported features (boolean caps). */

src/gallium/drivers/ilo/ilo_screen.c

@@ -450,6 +450,7 @@ ilo_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_ENDIANNESS:
       return PIPE_ENDIAN_LITTLE;
    case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
+   case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
       return true;
    case PIPE_CAP_TGSI_VS_LAYER_VIEWPORT:
    case PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES:

src/gallium/drivers/llvmpipe/lp_screen.c

@@ -109,6 +109,7 @@ llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    switch (param) {
    case PIPE_CAP_NPOT_TEXTURES:
    case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
+   case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
       return 1;
    case PIPE_CAP_TWO_SIDED_STENCIL:
       return 1;

src/gallium/drivers/nouveau/nv30/nv30_screen.c

@@ -200,6 +200,7 @@ nv30_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_MAX_WINDOW_RECTANGLES:
    case PIPE_CAP_POLYGON_OFFSET_UNITS_UNSCALED:
    case PIPE_CAP_VIEWPORT_SUBPIXEL_BITS:
+   case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:

src/gallium/drivers/nouveau/nv50/nv50_screen.c

@@ -150,6 +150,7 @@ nv50_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TEXTURE_SHADOW_MAP:
    case PIPE_CAP_NPOT_TEXTURES:
    case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
+   case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
    case PIPE_CAP_ANISOTROPIC_FILTER:
    case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
    case PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT:

src/gallium/drivers/nouveau/nvc0/nvc0_screen.c

@@ -173,6 +173,7 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TEXTURE_SHADOW_MAP:
    case PIPE_CAP_NPOT_TEXTURES:
    case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
+   case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
    case PIPE_CAP_ANISOTROPIC_FILTER:
    case PIPE_CAP_SEAMLESS_CUBE_MAP:
    case PIPE_CAP_CUBE_MAP_ARRAY:

src/gallium/drivers/r300/r300_screen.c

@@ -95,6 +95,7 @@ static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
         /* Supported features (boolean caps). */
         case PIPE_CAP_NPOT_TEXTURES:
         case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
+        case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
         case PIPE_CAP_TWO_SIDED_STENCIL:
         case PIPE_CAP_ANISOTROPIC_FILTER:
         case PIPE_CAP_POINT_SPRITE:

src/gallium/drivers/r600/r600_pipe.c

@@ -234,6 +234,7 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	/* Supported features (boolean caps). */
 	case PIPE_CAP_NPOT_TEXTURES:
 	case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
+	case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
 	case PIPE_CAP_TWO_SIDED_STENCIL:
 	case PIPE_CAP_ANISOTROPIC_FILTER:
 	case PIPE_CAP_POINT_SPRITE:

src/gallium/drivers/radeonsi/si_pipe.c

@@ -345,6 +345,7 @@ static int si_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_START_INSTANCE:
 	case PIPE_CAP_NPOT_TEXTURES:
 	case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
+	case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
 	case PIPE_CAP_VERTEX_COLOR_CLAMPED:
 	case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
         case PIPE_CAP_PREFER_BLIT_BASED_TEXTURE_TRANSFER:

src/gallium/drivers/softpipe/sp_screen.c

@@ -67,6 +67,7 @@ softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    switch (param) {
    case PIPE_CAP_NPOT_TEXTURES:
    case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
+   case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
       return 1;
    case PIPE_CAP_TWO_SIDED_STENCIL:
       return 1;

src/gallium/drivers/svga/svga_screen.c

@@ -179,6 +179,7 @@ svga_get_param(struct pipe_screen *screen, enum pipe_cap param)
    switch (param) {
    case PIPE_CAP_NPOT_TEXTURES:
    case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
+   case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
       return 1;
    case PIPE_CAP_TWO_SIDED_STENCIL:
       return 1;

src/gallium/drivers/swr/swr_screen.cpp

@@ -152,6 +152,7 @@ swr_get_param(struct pipe_screen *screen, enum pipe_cap param)
    switch (param) {
    case PIPE_CAP_NPOT_TEXTURES:
    case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
+   case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
       return 1;
    case PIPE_CAP_TWO_SIDED_STENCIL:
       return 1;

src/gallium/drivers/vc4/vc4_screen.c

@@ -141,6 +141,7 @@ vc4_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
                 return 1;
 
         case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
+        case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
                 return 1;
 
                 /* Unsupported features. */

src/gallium/drivers/virgl/virgl_screen.c

@@ -184,6 +184,7 @@ virgl_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_ENDIANNESS:
       return 0;
    case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
+   case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
       return 1;
    case PIPE_CAP_TGSI_VS_LAYER_VIEWPORT:
       return 0;

src/gallium/include/pipe/p_defines.h

@@ -737,6 +737,7 @@ enum pipe_cap
    PIPE_CAP_MAX_WINDOW_RECTANGLES,
    PIPE_CAP_POLYGON_OFFSET_UNITS_UNSCALED,
    PIPE_CAP_VIEWPORT_SUBPIXEL_BITS,
+   PIPE_CAP_MIXED_COLOR_DEPTH_BITS,
 };
 
 #define PIPE_QUIRK_TEXTURE_BORDER_COLOR_SWIZZLE_NV50 (1 << 0)