mesa: add support for GL_OES_EGL_image_external

This is an OpenGL ES specific extension.  External textures are textures that
may be sampled from, but not be updated (no glTexSubImage* and etc.).  The
image data are taken from an EGLImage.

Reviewed-by: Brian Paul <[email protected]>
Acked-by: Jakob Bornecrantz <[email protected]>

1 files changed, 15 insertions, 3 deletions

diff --git a/src/mesa/main/texobj.c b/src/mesa/main/texobj.c
index a8c0b8ee8b9..e2f0dc8b643 100644
--- a/src/mesa/main/texobj.c
+++ b/src/mesa/main/texobj.c
@@ -107,6 +107,7 @@ _mesa_initialize_texture_object( struct gl_texture_object *obj,
           target == GL_TEXTURE_RECTANGLE_NV ||
           target == GL_TEXTURE_1D_ARRAY_EXT ||
           target == GL_TEXTURE_2D_ARRAY_EXT ||
+          target == GL_TEXTURE_EXTERNAL_OES ||
           target == GL_TEXTURE_BUFFER);
 
    memset(obj, 0, sizeof(*obj));
@@ -119,8 +120,12 @@ _mesa_initialize_texture_object( struct gl_texture_object *obj,
    obj->BaseLevel = 0;
    obj->MaxLevel = 1000;
 
+   /* must be one; no support for (YUV) planes in separate buffers */
+   obj->RequiredTextureImageUnits = 1;
+
    /* sampler state */
-   if (target == GL_TEXTURE_RECTANGLE_NV) {
+   if (target == GL_TEXTURE_RECTANGLE_NV ||
+       target == GL_TEXTURE_EXTERNAL_OES) {
       obj->Sampler.WrapS = GL_CLAMP_TO_EDGE;
       obj->Sampler.WrapT = GL_CLAMP_TO_EDGE;
       obj->Sampler.WrapR = GL_CLAMP_TO_EDGE;
@@ -161,7 +166,8 @@ finish_texture_init(struct gl_context *ctx, GLenum target,
 {
    assert(obj->Target == 0);
 
-   if (target == GL_TEXTURE_RECTANGLE_NV) {
+   if (target == GL_TEXTURE_RECTANGLE_NV ||
+       target == GL_TEXTURE_EXTERNAL_OES) {
       /* have to init wrap and filter state here - kind of klunky */
       obj->Sampler.WrapS = GL_CLAMP_TO_EDGE;
       obj->Sampler.WrapT = GL_CLAMP_TO_EDGE;
@@ -259,6 +265,8 @@ _mesa_copy_texture_object( struct gl_texture_object *dest,
    dest->_Complete = src->_Complete;
    COPY_4V(dest->Swizzle, src->Swizzle);
    dest->_Swizzle = src->_Swizzle;
+
+   dest->RequiredTextureImageUnits = src->RequiredTextureImageUnits;
 }
 
 
@@ -306,6 +314,7 @@ valid_texture_object(const struct gl_texture_object *tex)
    case GL_TEXTURE_1D_ARRAY_EXT:
    case GL_TEXTURE_2D_ARRAY_EXT:
    case GL_TEXTURE_BUFFER:
+   case GL_TEXTURE_EXTERNAL_OES:
       return GL_TRUE;
    case 0x99:
       _mesa_problem(NULL, "invalid reference to a deleted texture object");
@@ -470,7 +479,8 @@ _mesa_test_texobj_completeness( const struct gl_context *ctx,
                      t->Image[0][baseLevel]->HeightLog2);
       maxLevels = ctx->Const.MaxCubeTextureLevels;
    }
-   else if (t->Target == GL_TEXTURE_RECTANGLE_NV) {
+   else if (t->Target == GL_TEXTURE_RECTANGLE_NV ||
+            t->Target == GL_TEXTURE_EXTERNAL_OES) {
       maxLog2 = 0;  /* not applicable */
       maxLevels = 1;  /* no mipmapping */
    }
@@ -1005,6 +1015,8 @@ target_enum_to_index(GLenum target)
       return TEXTURE_2D_ARRAY_INDEX;
    case GL_TEXTURE_BUFFER_ARB:
       return TEXTURE_BUFFER_INDEX;
+   case GL_TEXTURE_EXTERNAL_OES:
+      return TEXTURE_EXTERNAL_INDEX;
    default:
       return -1;
    }