mesa: core support for GL_ARB_texture_buffer_object

No GLSL or driver support yet.

1 files changed, 280 insertions, 2 deletions

diff --git a/src/mesa/main/teximage.c b/src/mesa/main/teximage.c
index 6161eb41456..c5c454336fa 100644
--- a/src/mesa/main/teximage.c
+++ b/src/mesa/main/teximage.c
@@ -681,8 +681,10 @@ _mesa_delete_texture_image(struct gl_context *ctx,
 GLboolean
 _mesa_is_proxy_texture(GLenum target)
 {
-   /* NUM_TEXTURE_TARGETS should match number of terms below */
-   assert(NUM_TEXTURE_TARGETS == 7);
+   /* NUM_TEXTURE_TARGETS should match number of terms below,
+    * except there's no proxy for GL_TEXTURE_BUFFER.
+    */
+   assert(NUM_TEXTURE_TARGETS == 8);
 
    return (target == GL_PROXY_TEXTURE_1D ||
            target == GL_PROXY_TEXTURE_2D ||
@@ -794,6 +796,9 @@ _mesa_select_tex_object(struct gl_context *ctx,
          return arrayTex ? texUnit->CurrentTex[TEXTURE_2D_ARRAY_INDEX] : NULL;
       case GL_PROXY_TEXTURE_2D_ARRAY_EXT:
          return arrayTex ? ctx->Texture.ProxyTex[TEXTURE_2D_ARRAY_INDEX] : NULL;
+      case GL_TEXTURE_BUFFER:
+         return ctx->Extensions.ARB_texture_buffer_object
+            ? texUnit->CurrentTex[TEXTURE_BUFFER_INDEX] : NULL;
       default:
          _mesa_problem(NULL, "bad target in _mesa_select_tex_object()");
          return NULL;
@@ -981,6 +986,8 @@ _mesa_max_texture_levels(struct gl_context *ctx, GLenum target)
       return (ctx->Extensions.MESA_texture_array ||
               ctx->Extensions.EXT_texture_array)
          ? ctx->Const.MaxTextureLevels : 0;
+   case GL_TEXTURE_BUFFER:
+      /* fall-through */
    default:
       return 0; /* bad target */
    }
@@ -1017,6 +1024,8 @@ _mesa_get_texture_dimensions(GLenum target)
    case GL_TEXTURE_2D_ARRAY:
    case GL_PROXY_TEXTURE_2D_ARRAY:
       return 3;
+   case GL_TEXTURE_BUFFER:
+      /* fall-through */
    default:
       _mesa_problem(NULL, "invalid target 0x%x in get_texture_dimensions()",
                     target);
@@ -3551,3 +3560,272 @@ _mesa_CompressedTexSubImage3DARB(GLenum target, GLint level, GLint xoffset,
    compressed_tex_sub_image(3, target, level, xoffset, yoffset, zoffset,
                             width, height, depth, format, imageSize, data);
 }
+
+
+/**
+ * Helper for glTexBuffer().  Check if internalFormat is legal.  If so,
+ * return the basic data type and number of components for the format.
+ * \param return  GL_TRUE if internalFormat is legal, GL_FALSE otherwise
+ */
+static GLboolean
+get_sized_format_info(const struct gl_context *ctx, GLenum internalFormat,
+                      GLenum *datatype, GLuint *components)
+{
+   switch (internalFormat) {
+   case GL_ALPHA8:
+      *datatype = GL_UNSIGNED_BYTE;
+      *components = 1;
+      break;
+   case GL_ALPHA16:
+      *datatype = GL_UNSIGNED_SHORT;
+      *components = 1;
+      break;
+   case GL_ALPHA16F_ARB:
+      *datatype = GL_HALF_FLOAT;
+      *components = 1;
+      break;
+   case GL_ALPHA32F_ARB:
+      *datatype = GL_FLOAT;
+      *components = 1;
+      break;
+   case GL_ALPHA8I_EXT:
+      *datatype = GL_BYTE;
+      *components = 1;
+      break;
+   case GL_ALPHA16I_EXT:
+      *datatype = GL_SHORT;
+      *components = 1;
+      break;
+   case GL_ALPHA32I_EXT:
+      *datatype = GL_INT;
+      *components = 1;
+      break;
+   case GL_ALPHA8UI_EXT:
+      *datatype = GL_UNSIGNED_BYTE;
+      *components = 1;
+      break;
+   case GL_ALPHA16UI_EXT:
+      *datatype = GL_UNSIGNED_SHORT;
+      *components = 1;
+      break;
+   case GL_ALPHA32UI_EXT:
+      *datatype = GL_UNSIGNED_INT;
+      *components = 1;
+      break;
+   case GL_LUMINANCE8:
+      *datatype = GL_UNSIGNED_BYTE;
+      *components = 1;
+      break;
+   case GL_LUMINANCE16:
+      *datatype = GL_UNSIGNED_SHORT;
+      *components = 1;
+      break;
+   case GL_LUMINANCE16F_ARB:
+      *datatype = GL_HALF_FLOAT;
+      *components = 1;
+      break;
+   case GL_LUMINANCE32F_ARB:
+      *datatype = GL_FLOAT;
+      *components = 1;
+      break;
+   case GL_LUMINANCE8I_EXT:
+      *datatype = GL_BYTE;
+      *components = 1;
+      break;
+   case GL_LUMINANCE16I_EXT:
+      *datatype = GL_SHORT;
+      *components = 1;
+      break;
+   case GL_LUMINANCE32I_EXT:
+      *datatype = GL_INT;
+      *components = 1;
+      break;
+   case GL_LUMINANCE8UI_EXT:
+      *datatype = GL_UNSIGNED_BYTE;
+      *components = 1;
+      break;
+   case GL_LUMINANCE16UI_EXT:
+      *datatype = GL_UNSIGNED_SHORT;
+      *components = 1;
+      break;
+   case GL_LUMINANCE32UI_EXT:
+      *datatype = GL_UNSIGNED_INT;
+      *components = 1;
+      break;
+   case GL_LUMINANCE8_ALPHA8:
+      *datatype = GL_UNSIGNED_BYTE;
+      *components = 2;
+      break;
+   case GL_LUMINANCE16_ALPHA16:
+      *datatype = GL_UNSIGNED_SHORT;
+      *components = 2;
+      break;
+   case GL_LUMINANCE_ALPHA16F_ARB:
+      *datatype = GL_HALF_FLOAT;
+      *components = 2;
+      break;
+   case GL_LUMINANCE_ALPHA32F_ARB:
+      *datatype = GL_FLOAT;
+      *components = 2;
+      break;
+   case GL_LUMINANCE_ALPHA8I_EXT:
+      *datatype = GL_BYTE;
+      *components = 2;
+      break;
+   case GL_LUMINANCE_ALPHA16I_EXT:
+      *datatype = GL_SHORT;
+      *components = 2;
+      break;
+   case GL_LUMINANCE_ALPHA32I_EXT:
+      *datatype = GL_INT;
+      *components = 2;
+      break;
+   case GL_LUMINANCE_ALPHA8UI_EXT:
+      *datatype = GL_UNSIGNED_BYTE;
+      *components = 2;
+      break;
+   case GL_LUMINANCE_ALPHA16UI_EXT:
+      *datatype = GL_UNSIGNED_SHORT;
+      *components = 2;
+      break;
+   case GL_LUMINANCE_ALPHA32UI_EXT:
+      *datatype = GL_UNSIGNED_INT;
+      *components = 2;
+      break;
+   case GL_INTENSITY8:
+      *datatype = GL_UNSIGNED_BYTE;
+      *components = 1;
+      break;
+   case GL_INTENSITY16:
+      *datatype = GL_UNSIGNED_SHORT;
+      *components = 1;
+      break;
+   case GL_INTENSITY16F_ARB:
+      *datatype = GL_HALF_FLOAT;
+      *components = 1;
+      break;
+   case GL_INTENSITY32F_ARB:
+      *datatype = GL_FLOAT;
+      *components = 1;
+      break;
+   case GL_INTENSITY8I_EXT:
+      *datatype = GL_BYTE;
+      *components = 1;
+      break;
+   case GL_INTENSITY16I_EXT:
+      *datatype = GL_SHORT;
+      *components = 1;
+      break;
+   case GL_INTENSITY32I_EXT:
+      *datatype = GL_INT;
+      *components = 1;
+      break;
+   case GL_INTENSITY8UI_EXT:
+      *datatype = GL_UNSIGNED_BYTE;
+      *components = 1;
+      break;
+   case GL_INTENSITY16UI_EXT:
+      *datatype = GL_UNSIGNED_SHORT;
+      *components = 1;
+      break;
+   case GL_INTENSITY32UI_EXT:
+      *datatype = GL_UNSIGNED_INT;
+      *components = 1;
+      break;
+   case GL_RGBA8:
+      *datatype = GL_UNSIGNED_BYTE;
+      *components = 4;
+      break;
+   case GL_RGBA16:
+      *datatype = GL_UNSIGNED_SHORT;
+      *components = 4;
+      break;
+   case GL_RGBA16F_ARB:
+      *datatype = GL_HALF_FLOAT;
+      *components = 4;
+      break;
+   case GL_RGBA32F_ARB:
+      *datatype = GL_FLOAT;
+      *components = 4;
+      break;
+   case GL_RGBA8I_EXT:
+      *datatype = GL_BYTE;
+      *components = 4;
+      break;
+   case GL_RGBA16I_EXT:
+      *datatype = GL_SHORT;
+      *components = 4;
+      break;
+   case GL_RGBA32I_EXT:
+      *datatype = GL_INT;
+      *components = 4;
+      break;
+   case GL_RGBA8UI_EXT:
+      *datatype = GL_UNSIGNED_BYTE;
+      *components = 4;
+      break;
+   case GL_RGBA16UI_EXT:
+      *datatype = GL_UNSIGNED_SHORT;
+      *components = 4;
+      break;
+   case GL_RGBA32UI_EXT:
+      *datatype = GL_UNSIGNED_INT;
+      *components = 4;
+      break;
+   default:
+      return GL_FALSE;
+   }
+
+   if (*datatype == GL_FLOAT && !ctx->Extensions.ARB_texture_float)
+      return GL_FALSE;
+
+   if (*datatype == GL_HALF_FLOAT && !ctx->Extensions.ARB_half_float_pixel)
+      return GL_FALSE;
+
+   return GL_TRUE;
+}
+
+
+/** GL_ARB_texture_buffer_object */
+void GLAPIENTRY
+_mesa_TexBuffer(GLenum target, GLenum internalFormat, GLuint buffer)
+{
+   struct gl_texture_object *texObj;
+   struct gl_buffer_object *bufObj;
+   GLenum dataType;
+   GLuint comps;
+
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+   if (!ctx->Extensions.ARB_texture_buffer_object) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glTexBuffer");
+      return;
+   }
+
+   if (target != GL_TEXTURE_BUFFER_ARB) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glTexBuffer(target)");
+      return;
+   }
+
+   if (!get_sized_format_info(ctx, internalFormat, &dataType, &comps)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glTexBuffer(internalFormat 0x%x)",
+                  internalFormat);
+      return;
+   }
+
+   bufObj = _mesa_lookup_bufferobj(ctx, buffer);
+   if (buffer && !bufObj) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glTexBuffer(buffer %u)", buffer);
+      return;
+   }
+
+   texObj = _mesa_get_current_tex_object(ctx, target);
+
+   _mesa_lock_texture(ctx, texObj);
+   {
+      _mesa_reference_buffer_object(ctx, &texObj->BufferObject, bufObj);
+      texObj->BufferObjectFormat = internalFormat;
+   }
+   _mesa_unlock_texture(ctx, texObj);
+}