[Mesa-dev] [PATCH 03/11] mesa: Add state data structures requried for ARB_shader_image_load_store.

[Francisco Jerez]

---
 src/mesa/main/config.h |   1 +
 src/mesa/main/dd.h     |   1 +
 src/mesa/main/mtypes.h | 100 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/mesa/main/texobj.c |   1 +
 4 files changed, 103 insertions(+)

diff --git a/src/mesa/main/config.h b/src/mesa/main/config.h
index 22bbfa0..8bd9765 100644
--- a/src/mesa/main/config.h
+++ b/src/mesa/main/config.h
@@ -175,6 +175,7 @@
 #define MAX_COMBINED_ATOMIC_BUFFERS    (MAX_UNIFORM_BUFFERS * 6)
 /* Size of an atomic counter in bytes according to ARB_shader_atomic_counters */
 #define ATOMIC_COUNTER_SIZE            4
+#define MAX_IMAGE_UNITS                32
 /*@}*/
 
 /**
diff --git a/src/mesa/main/dd.h b/src/mesa/main/dd.h
index b5b874f..648062f 100644
--- a/src/mesa/main/dd.h
+++ b/src/mesa/main/dd.h
@@ -39,6 +39,7 @@ struct gl_buffer_object;
 struct gl_context;
 struct gl_display_list;
 struct gl_framebuffer;
+struct gl_image_unit;
 struct gl_pixelstore_attrib;
 struct gl_program;
 struct gl_renderbuffer;
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index e9750f4..7be0664 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1207,6 +1207,9 @@ struct gl_texture_object
 
    /** GL_OES_EGL_image_external */
    GLint RequiredTextureImageUnits;
+
+   /** GL_ARB_shader_image_load_store */
+   GLenum ImageFormatCompatibility;
 };
 
 
@@ -2373,6 +2376,29 @@ struct gl_shader
         */
       GLenum OutputType;
    } Geom;
+
+   /**
+    * Map from image uniform index to image unit (set by glUniform1i())
+    *
+    * An image uniform index is associated with each image uniform by
+    * the linker.  The image index associated with each uniform is
+    * stored in the \c gl_uniform_storage::image field.
+    */
+   GLubyte ImageUnits[MAX_IMAGE_UNITS];
+
+   /**
+    * Access qualifier specified in the shader for each image uniform.
+    * Either \c GL_READ_ONLY, \c GL_WRITE_ONLY or \c GL_READ_WRITE.
+    *
+    * It may be different, though only more strict than the value of
+    * \c gl_image_unit::Access for the corresponding image unit.
+    */
+   GLenum ImageAccess[MAX_IMAGE_UNITS];
+
+   /**
+    * Number of image uniforms defined in the shader.
+    */
+   GLuint NumImages;
 };
 
 
@@ -3077,9 +3103,13 @@ struct gl_program_constants
    GLuint MaxUniformBlocks;
    GLuint MaxCombinedUniformComponents;
    GLuint MaxTextureImageUnits;
+
    /* GL_ARB_shader_atomic_counters */
    GLuint MaxAtomicBuffers;
    GLuint MaxAtomicCounters;
+
+   /* GL_ARB_shader_image_load_store */
+   GLuint MaxImageUniforms;
 };
 
 
@@ -3302,6 +3332,12 @@ struct gl_constants
    /** GL_ARB_vertex_attrib_binding */
    GLint MaxVertexAttribRelativeOffset;
    GLint MaxVertexAttribBindings;
+
+   /* GL_ARB_shader_image_load_store */
+   GLuint MaxImageUnits;
+   GLuint MaxCombinedImageUnitsAndFragmentOutputs;
+   GLuint MaxImageSamples;
+   GLuint MaxCombinedImageUniforms;
 };
 
 
@@ -3727,6 +3763,11 @@ struct gl_driver_flags
     * gl_context::AtomicBufferBindings
     */
    GLbitfield NewAtomicBuffer;
+
+   /**
+    * gl_context::ImageUnits
+    */
+   GLbitfield NewImageUnits;
 };
 
 struct gl_uniform_buffer_binding
@@ -3744,6 +3785,60 @@ struct gl_uniform_buffer_binding
 };
 
 /**
+ * ARB_shader_image_load_store image unit.
+ */
+struct gl_image_unit
+{
+   /**
+    * Texture object bound to this unit.
+    */
+   struct gl_texture_object *TexObj;
+
+   /**
+    * Level of the texture object bound to this unit.
+    */
+   GLuint Level;
+
+   /**
+    * \c GL_TRUE if the whole level is bound as an array of layers, \c
+    * GL_FALSE if only some specific layer of the texture is bound.
+    * \sa Layer
+    */
+   GLboolean Layered;
+
+   /**
+    * Layer of the texture object bound to this unit, or zero if \c
+    * Layered is \c GL_TRUE.
+    */
+   GLuint Layer;
+
+   /**
+    * Access allowed to this texture image.  Either \c GL_READ_ONLY,
+    * \c GL_WRITE_ONLY or \c GL_READ_WRITE.
+    */
+   GLenum Access;
+
+   /**
+    * GL internal format that determines the interpretation of the
+    * image memory when shader image operations are performed through
+    * this unit.
+    */
+   GLenum Format;
+
+   /**
+    * Mesa format corresponding to \c Format.
+    */
+   gl_format _ActualFormat;
+
+   /**
+    * GL_TRUE if the state of this image unit is valid and access from
+    * the shader is allowed.  Otherwise loads from this unit should
+    * return zero and stores should have no effect.
+    */
+   GLboolean _Valid;
+};
+
+/**
  * Binding point for an atomic counter buffer object.
  */
 struct gl_atomic_buffer_binding
@@ -3933,6 +4028,11 @@ struct gl_context
    struct gl_atomic_buffer_binding
       AtomicBufferBindings[MAX_COMBINED_ATOMIC_BUFFERS];
 
+   /**
+    * Array of image units for ARB_shader_image_load_store.
+    */
+   struct gl_image_unit ImageUnits[MAX_IMAGE_UNITS];
+
    /*@}*/
 
    struct gl_meta_state *Meta;  /**< for "meta" operations */
diff --git a/src/mesa/main/texobj.c b/src/mesa/main/texobj.c
index abd30c5..4f732fc 100644
--- a/src/mesa/main/texobj.c
+++ b/src/mesa/main/texobj.c
@@ -157,6 +157,7 @@ _mesa_initialize_texture_object( struct gl_context *ctx,
    obj->Sampler.sRGBDecode = GL_DECODE_EXT;
    obj->BufferObjectFormat = GL_R8;
    obj->_BufferObjectFormat = MESA_FORMAT_R8;
+   obj->ImageFormatCompatibility = GL_IMAGE_FORMAT_COMPATIBILITY_BY_SIZE;
 }
 
 
-- 
1.8.3.4