[Mesa-dev] [PATCH V2 1/2] meta: Refactor _mesa_meta_setup_blit_shader() to avoid duplicate shader code

[Pohjolainen, Topi]

On Tue, May 20, 2014 at 10:31:04AM -0700, Anuj Phogat wrote:
> Cc: <mesa-stable at lists.freedesktop.org>
> Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
> Reviewed-by: Matt Turner <mattst88 at gmail.com>
> ---
>  src/mesa/drivers/common/meta.c | 101 ++++++++++++++++++++---------------------
>  1 file changed, 48 insertions(+), 53 deletions(-)
> 
> diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c
> index 3ef3f79..fab9106 100644
> --- a/src/mesa/drivers/common/meta.c
> +++ b/src/mesa/drivers/common/meta.c
> @@ -242,10 +242,30 @@ _mesa_meta_setup_blit_shader(struct gl_context *ctx,
>                               GLenum target,
>                               struct blit_shader_table *table)
>  {
> -   const char *vs_source;
> -   char *fs_source;
> +   char *vs_source, *fs_source;
>     void *const mem_ctx = ralloc_context(NULL);
>     struct blit_shader *shader = choose_blit_shader(target, table);
> +   const char *vs_input, *vs_output, *fs_input, *vs_preprocess, *fs_preprocess;
> +   const char *fs_output_var, *fs_output_var_decl;
> +
> +   if (ctx->Const.GLSLVersion < 130) {
> +      vs_preprocess = "";
> +      vs_input = "attribute";
> +      vs_output = "varying";
> +      fs_preprocess = "#extension GL_EXT_texture_array : enable";
> +      fs_input = "varying";
> +      fs_output_var_decl = "";
> +      fs_output_var = "gl_FragColor";
> +   } else {
> +      vs_preprocess = "#version 130";
> +      vs_input = "in";
> +      vs_output = "out";
> +      fs_preprocess = "#version 130";
> +      fs_input = "in";
> +      fs_output_var_decl = "out vec4 out_color;";
> +      fs_output_var = "out_color";
> +      shader->func = "texture";
> +   }
>  
>     assert(shader != NULL);
>  
> @@ -254,57 +274,32 @@ _mesa_meta_setup_blit_shader(struct gl_context *ctx,
>        return;
>     }
>  
> -   if (ctx->Const.GLSLVersion < 130) {
> -      vs_source =
> -         "attribute vec2 position;\n"
> -         "attribute vec4 textureCoords;\n"
> -         "varying vec4 texCoords;\n"
> -         "void main()\n"
> -         "{\n"
> -         "   texCoords = textureCoords;\n"
> -         "   gl_Position = vec4(position, 0.0, 1.0);\n"
> -         "}\n";
> -
> -      fs_source = ralloc_asprintf(mem_ctx,
> -                                  "#extension GL_EXT_texture_array : enable\n"
> -                                  "#extension GL_ARB_texture_cube_map_array: enable\n"
> -                                  "uniform %s texSampler;\n"
> -                                  "varying vec4 texCoords;\n"
> -                                  "void main()\n"
> -                                  "{\n"
> -                                  "   gl_FragColor = %s(texSampler, %s);\n"
> -                                  "   gl_FragDepth = gl_FragColor.x;\n"
> -                                  "}\n",
> -                                  shader->type,
> -                                  shader->func, shader->texcoords);
> -   }
> -   else {
> -      vs_source = ralloc_asprintf(mem_ctx,
> -                                  "#version 130\n"
> -                                  "in vec2 position;\n"
> -                                  "in vec4 textureCoords;\n"
> -                                  "out vec4 texCoords;\n"
> -                                  "void main()\n"
> -                                  "{\n"
> -                                  "   texCoords = textureCoords;\n"
> -                                  "   gl_Position = vec4(position, 0.0, 1.0);\n"
> -                                  "}\n");
> -      fs_source = ralloc_asprintf(mem_ctx,
> -                                  "#version 130\n"
> -                                  "#extension GL_ARB_texture_cube_map_array: enable\n"
> -                                  "uniform %s texSampler;\n"
> -                                  "in vec4 texCoords;\n"
> -                                  "out vec4 out_color;\n"
> -                                  "\n"
> -                                  "void main()\n"
> -                                  "{\n"
> -                                  "   out_color = texture(texSampler, %s);\n"
> -                                  "   gl_FragDepth = out_color.x;\n"
> -                                  "}\n",
> -                                  shader->type,
> -                                  shader->texcoords);
> -   }
> -
> +   vs_source = ralloc_asprintf(mem_ctx,
> +                "%s\n"
> +                "%s vec2 position;\n"
> +                "%s vec4 textureCoords;\n"
> +                "%s vec4 texCoords;\n"
> +                "void main()\n"
> +                "{\n"
> +                "   texCoords = textureCoords;\n"
> +                "   gl_Position = vec4(position, 0.0, 1.0);\n"
> +                "}\n",
> +                vs_preprocess, vs_input, vs_input, vs_output);
> +
> +   fs_source = ralloc_asprintf(mem_ctx,
> +                "%s\n"
> +                "#extension GL_ARB_texture_cube_map_array: enable\n"
> +                "uniform %s texSampler;\n"
> +                "%s vec4 texCoords;\n"
> +                "%s\n"
> +                "void main()\n"
> +                "{\n"
> +                "   vec4 color = %s(texSampler, %s);\n"
> +                "   %s = color;\n"
> +                "   gl_FragDepth = color.x;\n"
> +                "}\n",
> +                fs_preprocess, shader->type, fs_input, fs_output_decl,
> +                shader->func, shader->texcoords, fs_output);

This won't compile, I guess you meant to use 'fs_output_var' and
'fs_output_var_decl' instead. Applying the second patch fixes this but...

>  
>     _mesa_meta_compile_and_link_program(ctx, vs_source, fs_source,
>                                         ralloc_asprintf(mem_ctx, "%s blit",
> -- 
> 1.8.3.1
> 
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