mesa: Add core support for EXT_multisampled_render_to_texture{,2}

This also turns on EXT_multisampled_render_to_texture which is a
subset of EXT_multisampled_render_to_texture2, allowing only
COLOR_ATTACHMENT0.

Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Kristian H. Kristensen <hoegsberg@chromium.org>

src/mapi/glapi/gen/EXT_multisampled_render_to_texture.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0"?>
+<!DOCTYPE OpenGLAPI SYSTEM "gl_API.dtd">
+
+<OpenGLAPI>
+
+<category name="GL_EXT_multisampled_render_to_texture" number="106">
+
+    <enum name="RENDERBUFFER_SAMPLES_EXT"                   value="0x8CAB"/>
+    <enum name="FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_EXT"     value="0x8D56"/>
+    <enum name="MAX_SAMPLES_EXT"                            value="0x8D57"/>
+    <enum name="FRAMEBUFFER_ATTACHMENT_TEXTURE_SAMPLES_EXT" value="0x8D6C"/>
+
+<!-- Already defined in EXT_framebuffer_object.xml
+    <function name="RenderbufferStorageMultisampleEXT" es2="2.0">
+        <param name="target" type="GLenum"/>
+	<param name="samples" type="GLsizei"/>
+        <param name="internalformat" type="GLenum"/>
+        <param name="width" type="GLsizei"/>
+	<param name="height" type="GLsizei"/>
+    </function>
+-->
+
+    <function name="FramebufferTexture2DMultisampleEXT" es2="2.0">
+        <param name="target" type="GLenum"/>
+        <param name="attachment" type="GLenum"/>
+        <param name="textarget" type="GLenum"/>
+        <param name="texture" type="GLuint"/>
+        <param name="level" type="GLint"/>
+        <param name="samples" type="GLsizei"/>
+    </function>
+
+</category>
+
+</OpenGLAPI>

src/mapi/glapi/gen/Makefile.am

@@ -200,6 +200,7 @@ API_XML = \
 	EXT_external_objects_fd.xml \
 	EXT_framebuffer_object.xml \
 	EXT_gpu_shader4.xml \
+	EXT_multisampled_render_to_texture.xml \
 	EXT_packed_depth_stencil.xml \
 	EXT_provoking_vertex.xml \
 	EXT_separate_shader_objects.xml \

src/mapi/glapi/gen/gl_API.xml

@@ -8175,6 +8175,8 @@
 
 <xi:include href="ARB_robustness.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
 
+<xi:include href="EXT_multisampled_render_to_texture.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
+
 <xi:include href="ARB_base_instance.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
 
 <category name="GL_ARB_transform_feedback_instanced" number="109">

src/mapi/glapi/gen/meson.build

@@ -107,6 +107,7 @@ api_xml_files = files(
   'EXT_external_objects_fd.xml',
   'EXT_framebuffer_object.xml',
   'EXT_gpu_shader4.xml',
+  'EXT_multisampled_render_to_texture.xml',
   'EXT_packed_depth_stencil.xml',
   'EXT_provoking_vertex.xml',
   'EXT_separate_shader_objects.xml',

src/mesa/drivers/common/meta.c

@@ -127,7 +127,7 @@ _mesa_meta_framebuffer_texture_image(struct gl_context *ctx,
    assert(att);
 
    _mesa_framebuffer_texture(ctx, fb, attachment, att, texObj, texTarget,
-                             level, layer, false);
+                             level, att->NumSamples, layer, false);
 }
 
 static struct gl_shader *

src/mesa/main/extensions_table.h

@@ -242,6 +242,8 @@ EXT(EXT_map_buffer_range                    , ARB_map_buffer_range
 EXT(EXT_memory_object                       , EXT_memory_object                      , GLL, GLC,  x , ES2, 2017)
 EXT(EXT_memory_object_fd                    , EXT_memory_object_fd                   , GLL, GLC,  x , ES2, 2017)
 EXT(EXT_multi_draw_arrays                   , dummy_true                             , GLL,  x , ES1, ES2, 1999)
+EXT(EXT_multisampled_render_to_texture      , EXT_multisampled_render_to_texture     ,  x ,  x ,  x , ES2, 2016)
+EXT(EXT_multisampled_render_to_texture2     , EXT_multisampled_render_to_texture     ,  x ,  x ,  x , ES2, 2016)
 EXT(EXT_occlusion_query_boolean             , ARB_occlusion_query2                   ,  x ,  x ,  x , ES2, 2011)
 EXT(EXT_packed_depth_stencil                , dummy_true                             , GLL, GLC,  x ,  x , 2005)
 EXT(EXT_packed_float                        , EXT_packed_float                       , GLL, GLC,  x ,  x , 2004)

src/mesa/main/fbobject.c

@@ -497,8 +497,8 @@ set_texture_attachment(struct gl_context *ctx,
                        struct gl_framebuffer *fb,
                        struct gl_renderbuffer_attachment *att,
                        struct gl_texture_object *texObj,
-                       GLenum texTarget, GLuint level, GLuint layer,
+                       GLenum texTarget, GLuint level, GLsizei samples,
-                       GLboolean layered)
+                       GLuint layer, GLboolean layered)
 {
    struct gl_renderbuffer *rb = att->Renderbuffer;
 
@@ -520,6 +520,7 @@ set_texture_attachment(struct gl_context *ctx,
 
    /* always update these fields */
    att->TextureLevel = level;
+   att->NumSamples = samples;
    att->CubeMapFace = _mesa_tex_target_to_face(texTarget);
    att->Zoffset = layer;
    att->Layered = layered;
@@ -1085,8 +1086,11 @@ _mesa_test_framebuffer_completeness(struct gl_context *ctx,
             return;
          }
 
-         attNumSamples = texImg->NumSamples;
+         if (att->NumSamples > 0)
-         attNumStorageSamples = texImg->NumSamples;
+            attNumSamples = att->NumSamples;
+         else
+            attNumSamples = texImg->NumSamples;
+         attNumStorageSamples = attNumSamples;
       }
       else if (att->Type == GL_RENDERBUFFER_EXT) {
          minWidth = MIN2(minWidth, att->Renderbuffer->Width);
@@ -3498,7 +3502,8 @@ _mesa_framebuffer_texture(struct gl_context *ctx, struct gl_framebuffer *fb,
                           GLenum attachment,
                           struct gl_renderbuffer_attachment *att,
                           struct gl_texture_object *texObj, GLenum textarget,
-                          GLint level, GLuint layer, GLboolean layered)
+                          GLint level, GLsizei samples,
+                          GLuint layer, GLboolean layered)
 {
    FLUSH_VERTICES(ctx, _NEW_BUFFERS);
 
@@ -3509,6 +3514,7 @@ _mesa_framebuffer_texture(struct gl_context *ctx, struct gl_framebuffer *fb,
           level == fb->Attachment[BUFFER_STENCIL].TextureLevel &&
           _mesa_tex_target_to_face(textarget) ==
           fb->Attachment[BUFFER_STENCIL].CubeMapFace &&
+          samples == fb->Attachment[BUFFER_STENCIL].NumSamples &&
           layer == fb->Attachment[BUFFER_STENCIL].Zoffset) {
          /* The texture object is already attached to the stencil attachment
           * point. Don't create a new renderbuffer; just reuse the stencil
@@ -3522,13 +3528,14 @@ _mesa_framebuffer_texture(struct gl_context *ctx, struct gl_framebuffer *fb,
                  level == fb->Attachment[BUFFER_DEPTH].TextureLevel &&
                  _mesa_tex_target_to_face(textarget) ==
                  fb->Attachment[BUFFER_DEPTH].CubeMapFace &&
+                 samples == fb->Attachment[BUFFER_DEPTH].NumSamples &&
                  layer == fb->Attachment[BUFFER_DEPTH].Zoffset) {
          /* As above, but with depth and stencil transposed. */
          reuse_framebuffer_texture_attachment(fb, BUFFER_STENCIL,
                                               BUFFER_DEPTH);
       } else {
          set_texture_attachment(ctx, fb, att, texObj, textarget,
-                                level, layer, layered);
+                                level, samples, layer, layered);
 
          if (attachment == GL_DEPTH_STENCIL_ATTACHMENT) {
             /* Above we created a new renderbuffer and attached it to the
@@ -3583,15 +3590,15 @@ framebuffer_texture_with_dims_no_error(GLenum target, GLenum attachment,
       get_attachment(ctx, fb, attachment, NULL);
 
    _mesa_framebuffer_texture(ctx, fb, attachment, att, texObj, textarget,
-                             level, layer, GL_FALSE);
+                             level, 0, layer, GL_FALSE);
 }
 
 
 static void
 framebuffer_texture_with_dims(int dims, GLenum target,
                               GLenum attachment, GLenum textarget,
-                              GLuint texture, GLint level, GLint layer,
+                              GLuint texture, GLint level, GLsizei samples,
-                              const char *caller)
+                              GLint layer, const char *caller)
 {
    GET_CURRENT_CONTEXT(ctx);
    struct gl_framebuffer *fb;
@@ -3626,7 +3633,7 @@ framebuffer_texture_with_dims(int dims, GLenum target,
       return;
 
    _mesa_framebuffer_texture(ctx, fb, attachment, att, texObj, textarget,
-                             level, layer, GL_FALSE);
+                             level, samples, layer, GL_FALSE);
 }
 
 
@@ -3645,7 +3652,7 @@ _mesa_FramebufferTexture1D(GLenum target, GLenum attachment,
                            GLenum textarget, GLuint texture, GLint level)
 {
    framebuffer_texture_with_dims(1, target, attachment, textarget, texture,
-                                 level, 0, "glFramebufferTexture1D");
+                                 level, 0, 0, "glFramebufferTexture1D");
 }
 
 
@@ -3664,7 +3671,17 @@ _mesa_FramebufferTexture2D(GLenum target, GLenum attachment,
                            GLenum textarget, GLuint texture, GLint level)
 {
    framebuffer_texture_with_dims(2, target, attachment, textarget, texture,
-                                 level, 0, "glFramebufferTexture2D");
+                                 level, 0, 0, "glFramebufferTexture2D");
+}
+
+
+void GLAPIENTRY
+_mesa_FramebufferTexture2DMultisampleEXT(GLenum target, GLenum attachment,
+                                         GLenum textarget, GLuint texture,
+                                         GLint level, GLsizei samples)
+{
+   framebuffer_texture_with_dims(2, target, attachment, textarget, texture,
+                                 level, samples, 0, "glFramebufferTexture2DMultisampleEXT");
 }
 
 
@@ -3684,7 +3701,7 @@ _mesa_FramebufferTexture3D(GLenum target, GLenum attachment,
                            GLint level, GLint layer)
 {
    framebuffer_texture_with_dims(3, target, attachment, textarget, texture,
-                                 level, layer, "glFramebufferTexture3D");
+                                 level, 0, layer, "glFramebufferTexture3D");
 }
 
 
@@ -3774,7 +3791,7 @@ frame_buffer_texture(GLuint framebuffer, GLenum target,
    }
 
    _mesa_framebuffer_texture(ctx, fb, attachment, att, texObj, textarget,
-                             level, layer, layered);
+                             level, 0, layer, layered);
 }
 
 void GLAPIENTRY
@@ -4357,6 +4374,18 @@ get_framebuffer_attachment_parameter(struct gl_context *ctx,
          goto invalid_pname_enum;
       }
       return;
+   case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_SAMPLES_EXT:
+      if (!ctx->Extensions.EXT_multisampled_render_to_texture) {
+         goto invalid_pname_enum;
+      } else if (att->Type == GL_TEXTURE) {
+         *params = att->NumSamples;
+      } else if (att->Type == GL_NONE) {
+         _mesa_error(ctx, err, "%s(invalid pname %s)", caller,
+                     _mesa_enum_to_string(pname));
+      } else {
+         goto invalid_pname_enum;
+      }
+      return;
    default:
       goto invalid_pname_enum;
    }

src/mesa/main/fbobject.h

@@ -129,7 +129,8 @@ _mesa_framebuffer_texture(struct gl_context *ctx, struct gl_framebuffer *fb,
                           GLenum attachment,
                           struct gl_renderbuffer_attachment *att,
                           struct gl_texture_object *texObj, GLenum textarget,
-                          GLint level, GLuint layer, GLboolean layered);
+                          GLint level, GLsizei samples,
+                          GLuint layer, GLboolean layered);
 
 extern GLenum
 _mesa_check_framebuffer_status(struct gl_context *ctx,
@@ -250,6 +251,11 @@ extern void GLAPIENTRY
 _mesa_FramebufferTexture2D(GLenum target, GLenum attachment,
                               GLenum textarget, GLuint texture, GLint level);
 
+void GLAPIENTRY
+_mesa_FramebufferTexture2DMultisampleEXT(GLenum target, GLenum attachment,
+                                         GLenum textarget, GLuint texture,
+                                         GLint level, GLsizei samples);
+
 extern void GLAPIENTRY
 _mesa_FramebufferTexture3D_no_error(GLenum target, GLenum attachment,
                                     GLenum textarget, GLuint texture,

src/mesa/main/glheader.h

@@ -151,6 +151,9 @@ typedef int GLclampx;
  */
 #define GL_SHADER_PROGRAM_MESA                                  0x9999
 
+#ifndef GL_EXT_multisampled_render_to_texture
+#define GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_SAMPLES_EXT 0x8D6C
+#endif
 
 #ifdef __cplusplus
 }

src/mesa/main/mtypes.h

@@ -3414,6 +3414,7 @@ struct gl_renderbuffer_attachment
     */
    struct gl_texture_object *Texture;
    GLuint TextureLevel; /**< Attached mipmap level. */
+   GLsizei NumSamples;  /**< from FramebufferTexture2DMultisampleEXT */
    GLuint CubeMapFace;  /**< 0 .. 5, for cube map textures. */
    GLuint Zoffset;      /**< Slice for 3D textures,  or layer for both 1D
                          * and 2D array textures */
@@ -4254,6 +4255,7 @@ struct gl_extensions
    GLboolean EXT_gpu_shader4;
    GLboolean EXT_memory_object;
    GLboolean EXT_memory_object_fd;
+   GLboolean EXT_multisampled_render_to_texture;
    GLboolean EXT_packed_float;
    GLboolean EXT_pixel_buffer_object;
    GLboolean EXT_point_parameters;