blitter: handle GL_FRAMEBUFFER_SRGB for emulated blits

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/vrend_blitter.c

@@ -700,7 +700,8 @@ void vrend_renderer_blit_gl(UNUSED struct vrend_context *ctx,
                             struct vrend_resource *src_res,
                             struct vrend_resource *dst_res,
                             const struct pipe_blit_info *info,
-                            bool has_texture_srgb_decode)
+                            bool has_texture_srgb_decode,
+                            bool has_srgb_write_control)
 {
    struct vrend_blitter_ctx *blit_ctx = &vrend_blit_ctx;
    GLuint buffers;
@@ -842,6 +843,13 @@ void vrend_renderer_blit_gl(UNUSED struct vrend_context *ctx,
       glBindFramebuffer(GL_FRAMEBUFFER, blit_ctx->fb_id);
       vrend_fb_bind_texture(dst_res, 0, info->dst.level, layer);
 
+      if (has_srgb_write_control) {
+         if (util_format_is_srgb(info->dst.format))
+            glEnable(GL_FRAMEBUFFER_SRGB);
+         else
+            glDisable(GL_FRAMEBUFFER_SRGB);
+      }
+
       buffers = GL_COLOR_ATTACHMENT0;
       glDrawBuffers(1, &buffers);
       blitter_set_texcoords(blit_ctx, src_res, info->src.level,

src/vrend_renderer.c

@@ -7346,7 +7346,8 @@ static void vrend_renderer_blit_int(struct vrend_context *ctx,
    if (use_gl) {
       VREND_DEBUG(dbg_blit, ctx, "BLIT_INT: use GL fallback\n");
       vrend_renderer_blit_gl(ctx, src_res, dst_res, info,
-                             has_feature(feat_texture_srgb_decode));
+                             has_feature(feat_texture_srgb_decode),
+                             has_feature(feat_srgb_write_control));
       vrend_clicbs->make_current(ctx->sub->gl_context);
       return;
    }

src/vrend_renderer.h

@@ -405,7 +405,8 @@ void vrend_renderer_blit_gl(struct vrend_context *ctx,
                             struct vrend_resource *src_res,
                             struct vrend_resource *dst_res,
                             const struct pipe_blit_info *info,
-                            bool has_texture_srgb_decode);
+                            bool has_texture_srgb_decode,
+                            bool has_srgb_write_control);
 void vrend_blitter_fini(void);
 
 void vrend_renderer_reset(void);