gallium: add PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE for GL

v2: fix typo 65535 -> 65536

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

src/gallium/docs/source/screen.rst

@@ -162,6 +162,8 @@ The integer capabilities:
   state should be swizzled manually according to the swizzle in the sampler
   view it is intended to be used with, or herein undefined results may occur
   for permutational swizzles.
+* ``PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE``: The maximum accessible size with
+  a buffer sampler view, in bytes.
 
 
 .. _pipe_capf:

src/gallium/drivers/llvmpipe/lp_screen.c

@@ -224,6 +224,8 @@ llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
       return 0;
    case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
       return 1;
+   case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
+      return 65536;
    case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
       return 1;
    case PIPE_CAP_PREFER_BLIT_BASED_TEXTURE_TRANSFER:

src/gallium/drivers/nv30/nv30_screen.c

@@ -124,6 +124,7 @@ nv30_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
    case PIPE_CAP_QUERY_PIPELINE_STATISTICS:
    case PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK:
+   case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
       return 0;
    case PIPE_CAP_VERTEX_BUFFER_OFFSET_4BYTE_ALIGNED_ONLY:
    case PIPE_CAP_VERTEX_BUFFER_STRIDE_4BYTE_ALIGNED_ONLY:

src/gallium/drivers/nv50/nv50_screen.c

@@ -105,6 +105,8 @@ nv50_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_SCALED_RESOLVE:
    case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
       return 1;
+   case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
+      return 65536;
    case PIPE_CAP_SEAMLESS_CUBE_MAP:
       return nv50_screen(pscreen)->tesla->oclass >= NVA0_3D_CLASS;
    case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:

src/gallium/drivers/nvc0/nvc0_screen.c

@@ -104,6 +104,8 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
    case PIPE_CAP_TEXTURE_MULTISAMPLE:
       return 1;
+   case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
+      return 65536;
    case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
       return (class_3d >= NVE4_3D_CLASS) ? 1 : 0;
    case PIPE_CAP_TWO_SIDED_STENCIL:

src/gallium/drivers/r300/r300_screen.c

@@ -163,6 +163,7 @@ static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
         case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
         case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
         case PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK:
+        case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
             return 0;
 
         /* SWTCL-only features. */

src/gallium/drivers/r600/r600_pipe.c

@@ -595,6 +595,9 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_TGSI_TEXCOORD:
 		return 0;
 
+	case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
+		return MIN2(rscreen->info.vram_size, 0xFFFFFFFF);
+
         case PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT:
                 return R600_MAP_BUFFER_ALIGNMENT;
 

src/gallium/drivers/radeonsi/radeonsi_pipe.c

@@ -381,6 +381,7 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
 	case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
 	case PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK:
+        case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
 		return 0;
 
 	/* Stream output. */

src/gallium/drivers/softpipe/sp_screen.c

@@ -175,6 +175,8 @@ softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
       return 1;
    case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
       return 1;
+   case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
+      return 65536;
    case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
       return 0;
    case PIPE_CAP_TGSI_TEXCOORD:

src/gallium/drivers/svga/svga_screen.c

@@ -265,6 +265,7 @@ svga_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
    case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
    case PIPE_CAP_QUERY_PIPELINE_STATISTICS:
+   case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
       return 0;
    case PIPE_CAP_VERTEX_ELEMENT_SRC_OFFSET_4BYTE_ALIGNED_ONLY:
       return 1;

src/gallium/include/pipe/p_defines.h

@@ -506,7 +506,8 @@ enum pipe_cap {
    PIPE_CAP_TGSI_TEXCOORD = 79,
    PIPE_CAP_PREFER_BLIT_BASED_TEXTURE_TRANSFER = 80,
    PIPE_CAP_QUERY_PIPELINE_STATISTICS = 81,
-   PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK = 82
+   PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK = 82,
+   PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE = 83
 };
 
 #define PIPE_QUIRK_TEXTURE_BORDER_COLOR_SWIZZLE_NV50 (1 << 0)

src/mesa/state_tracker/st_extensions.c

@@ -39,7 +39,7 @@
 #include "st_extensions.h"
 #include "st_format.h"
 
-static int _min(int a, int b)
+static unsigned _min(unsigned a, unsigned b)
 {
    return (a < b) ? a : b;
 }
@@ -744,6 +744,9 @@ void st_init_extensions(struct st_context *st)
    if (screen->get_param(screen, PIPE_CAP_TEXTURE_BUFFER_OBJECTS)) {
       ctx->Extensions.ARB_texture_buffer_object = GL_TRUE;
 
+      ctx->Const.MaxTextureBufferSize =
+         _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE),
+              (1u << 31) - 1);
       ctx->Const.TextureBufferOffsetAlignment =
          screen->get_param(screen, PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT);