[PATCH 5/6] wined3d: Add ARB_shader_storage_buffer_object extension.

[Józef Kucia]

Nvidia binary drivers require the ARB_shader_storage_buffer_object
extension to be enabled in order to use atomic operations on compute
shader shared variables.

Signed-off-by: Józef Kucia <jkucia at codeweavers.com>
---

This is a workaround for a driver bug. The
ARB_shader_storage_buffer_object spec says:
  "Note that no "#extension" directive is necessary to use atomic memory
  functions on shared variables in compute shaders."

Without this change a test added in the next patch fails on proprietary
Nvidia drivers.

---
 dlls/wined3d/directx.c     | 4 ++++
 dlls/wined3d/glsl_shader.c | 2 ++
 dlls/wined3d/wined3d_gl.h  | 1 +
 3 files changed, 7 insertions(+)

diff --git a/dlls/wined3d/directx.c b/dlls/wined3d/directx.c
index 02df3f0..5fa34e5 100644
--- a/dlls/wined3d/directx.c
+++ b/dlls/wined3d/directx.c
@@ -150,6 +150,7 @@ static const struct wined3d_extension_map gl_extension_map[] =
     {"GL_ARB_shader_bit_encoding",          ARB_SHADER_BIT_ENCODING       },
     {"GL_ARB_shader_image_load_store",      ARB_SHADER_IMAGE_LOAD_STORE   },
     {"GL_ARB_shader_image_size",            ARB_SHADER_IMAGE_SIZE         },
+    {"GL_ARB_shader_storage_buffer_object", ARB_SHADER_STORAGE_BUFFER_OBJECT},
     {"GL_ARB_shader_texture_lod",           ARB_SHADER_TEXTURE_LOD        },
     {"GL_ARB_shading_language_100",         ARB_SHADING_LANGUAGE_100      },
     {"GL_ARB_shading_language_420pack",     ARB_SHADING_LANGUAGE_420PACK  },
@@ -2832,6 +2833,8 @@ static void load_gl_funcs(struct wined3d_gl_info *gl_info)
     USE_GL_FUNC(glUniformMatrix4fvARB)
     USE_GL_FUNC(glUseProgramObjectARB)
     USE_GL_FUNC(glValidateProgramARB)
+    /* GL_ARB_shader_storage_buffer_object */
+    USE_GL_FUNC(glShaderStorageBlockBinding)
     /* GL_ARB_sync */
     USE_GL_FUNC(glClientWaitSync)
     USE_GL_FUNC(glDeleteSync)
@@ -3774,6 +3777,7 @@ static BOOL wined3d_adapter_init_gl_caps(struct wined3d_adapter *adapter,
         {ARB_ES3_COMPATIBILITY,            MAKEDWORD_VERSION(4, 3)},
         {ARB_INTERNALFORMAT_QUERY2,        MAKEDWORD_VERSION(4, 3)},
         {ARB_SHADER_IMAGE_SIZE,            MAKEDWORD_VERSION(4, 3)},
+        {ARB_SHADER_STORAGE_BUFFER_OBJECT, MAKEDWORD_VERSION(4, 3)},
         {ARB_STENCIL_TEXTURING,            MAKEDWORD_VERSION(4, 3)},
         {ARB_TEXTURE_BUFFER_RANGE,         MAKEDWORD_VERSION(4, 3)},
         {ARB_TEXTURE_QUERY_LEVELS,         MAKEDWORD_VERSION(4, 3)},
diff --git a/dlls/wined3d/glsl_shader.c b/dlls/wined3d/glsl_shader.c
index e5dd567..d6bb622 100644
--- a/dlls/wined3d/glsl_shader.c
+++ b/dlls/wined3d/glsl_shader.c
@@ -6613,6 +6613,8 @@ static void shader_glsl_enable_extensions(struct wined3d_string_buffer *buffer,
         shader_addline(buffer, "#extension GL_ARB_shader_image_load_store : enable\n");
     if (gl_info->supported[ARB_SHADER_IMAGE_SIZE])
         shader_addline(buffer, "#extension GL_ARB_shader_image_size : enable\n");
+    if (gl_info->supported[ARB_SHADER_STORAGE_BUFFER_OBJECT])
+        shader_addline(buffer, "#extension GL_ARB_shader_storage_buffer_object : enable\n");
     if (gl_info->supported[ARB_SHADING_LANGUAGE_420PACK])
         shader_addline(buffer, "#extension GL_ARB_shading_language_420pack : enable\n");
     if (gl_info->supported[ARB_SHADING_LANGUAGE_PACKING])
diff --git a/dlls/wined3d/wined3d_gl.h b/dlls/wined3d/wined3d_gl.h
index 396f93f..fa5985c 100644
--- a/dlls/wined3d/wined3d_gl.h
+++ b/dlls/wined3d/wined3d_gl.h
@@ -83,6 +83,7 @@ enum wined3d_gl_extension
     ARB_SHADER_BIT_ENCODING,
     ARB_SHADER_IMAGE_LOAD_STORE,
     ARB_SHADER_IMAGE_SIZE,
+    ARB_SHADER_STORAGE_BUFFER_OBJECT,
     ARB_SHADER_TEXTURE_LOD,
     ARB_SHADING_LANGUAGE_100,
     ARB_SHADING_LANGUAGE_420PACK,
-- 
2.10.2