mesa: add support for AlphaToCoverageDitherControlNV

Reviewed-by: Marek Olšák <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4543>

9 files changed, 55 insertions, 0 deletions

diff --git a/src/mesa/main/attrib.c b/src/mesa/main/attrib.c
index 35231335813..e95bf19846b 100644
--- a/src/mesa/main/attrib.c
+++ b/src/mesa/main/attrib.c
@@ -1519,6 +1519,8 @@ _mesa_PopAttrib(void)
 
                _mesa_SampleCoverage(ms->SampleCoverageValue,
                                        ms->SampleCoverageInvert);
+
+               _mesa_AlphaToCoverageDitherControlNV(ms->SampleAlphaToCoverageDitherControl);
             }
             break;
 
diff --git a/src/mesa/main/extensions_table.h b/src/mesa/main/extensions_table.h
index 66f5d2e9d9d..18d5f8073bf 100644
--- a/src/mesa/main/extensions_table.h
+++ b/src/mesa/main/extensions_table.h
@@ -371,6 +371,7 @@ EXT(MESA_ycbcr_texture                      , MESA_ycbcr_texture
 
 EXT(NVX_gpu_memory_info                     , NVX_gpu_memory_info                    , GLL, GLC,  x ,  x , 2013)
 
+EXT(NV_alpha_to_coverage_dither_control     , NV_alpha_to_coverage_dither_control    , GLL, GLC,  x , ES2, 2017)
 EXT(NV_blend_square                         , dummy_true                             , GLL,  x ,  x ,  x , 1999)
 EXT(NV_compute_shader_derivatives           , NV_compute_shader_derivatives          , GLL, GLC,  x ,  32, 2018)
 EXT(NV_conditional_render                   , NV_conditional_render                  , GLL, GLC,  x , ES2, 2008)
diff --git a/src/mesa/main/get_hash_params.py b/src/mesa/main/get_hash_params.py
index 31563679593..1e09c48aca0 100644
--- a/src/mesa/main/get_hash_params.py
+++ b/src/mesa/main/get_hash_params.py
@@ -382,6 +382,9 @@ descriptor=[
   [ "MAX_DEPTH_STENCIL_FRAMEBUFFER_SAMPLES_AMD", "CONTEXT_INT(Const.MaxDepthStencilFramebufferSamples), extra_AMD_framebuffer_multisample_advanced" ],
   [ "NUM_SUPPORTED_MULTISAMPLE_MODES_AMD", "CONTEXT_INT(Const.NumSupportedMultisampleModes), extra_AMD_framebuffer_multisample_advanced" ],
   [ "SUPPORTED_MULTISAMPLE_MODES_AMD", "LOC_CUSTOM, TYPE_INT_N, 0, extra_AMD_framebuffer_multisample_advanced" ],
+
+# GL_NV_alpha_to_coverage_dither_control
+  [ "ALPHA_TO_COVERAGE_DITHER_MODE_NV", "CONTEXT_ENUM(Multisample.SampleAlphaToCoverageDitherControl ), NO_EXTRA" ],
 ]},
 
 # GLES3 is not a typo.
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 62f1e9be5bc..1f1e8e7ada0 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -689,6 +689,9 @@ struct gl_multisample_attrib
 
    /** The GL spec defines this as an array but >32x MSAA is madness */
    GLbitfield SampleMaskValue;
+
+   /* NV_alpha_to_coverage_dither_control */
+   GLenum SampleAlphaToCoverageDitherControl;
 };
 
 
@@ -4387,6 +4390,7 @@ struct gl_extensions
    GLboolean EXT_shader_framebuffer_fetch_non_coherent;
    GLboolean MESA_shader_integer_functions;
    GLboolean MESA_ycbcr_texture;
+   GLboolean NV_alpha_to_coverage_dither_control;
    GLboolean NV_compute_shader_derivatives;
    GLboolean NV_conditional_render;
    GLboolean NV_copy_image;
diff --git a/src/mesa/main/multisample.c b/src/mesa/main/multisample.c
index d494a43ac7d..66eb0c8b98e 100644
--- a/src/mesa/main/multisample.c
+++ b/src/mesa/main/multisample.c
@@ -63,6 +63,7 @@ _mesa_init_multisample(struct gl_context *ctx)
 {
    ctx->Multisample.Enabled = GL_TRUE;
    ctx->Multisample.SampleAlphaToCoverage = GL_FALSE;
+   ctx->Multisample.SampleAlphaToCoverageDitherControl = GL_ALPHA_TO_COVERAGE_DITHER_DEFAULT_NV;
    ctx->Multisample.SampleAlphaToOne = GL_FALSE;
    ctx->Multisample.SampleCoverage = GL_FALSE;
    ctx->Multisample.SampleCoverageValue = 1.0;
@@ -351,3 +352,33 @@ _mesa_check_sample_count(struct gl_context *ctx, GLenum target,
    return (GLuint) samples > ctx->Const.MaxSamples
       ? GL_INVALID_VALUE : GL_NO_ERROR;
 }
+
+void GLAPIENTRY
+_mesa_AlphaToCoverageDitherControlNV_no_error(GLenum mode)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   FLUSH_VERTICES(ctx, ctx->DriverFlags.NewSampleAlphaToXEnable ? 0 :
+                                                   _NEW_MULTISAMPLE);
+   ctx->NewDriverState |= ctx->DriverFlags.NewSampleAlphaToXEnable;
+   ctx->Multisample.SampleAlphaToCoverageDitherControl = mode;
+}
+
+void GLAPIENTRY
+_mesa_AlphaToCoverageDitherControlNV(GLenum mode)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   FLUSH_VERTICES(ctx, ctx->DriverFlags.NewSampleAlphaToXEnable ? 0 :
+                                                   _NEW_MULTISAMPLE);
+   ctx->NewDriverState |= ctx->DriverFlags.NewSampleAlphaToXEnable;
+   switch (mode) {
+      case GL_ALPHA_TO_COVERAGE_DITHER_DEFAULT_NV:
+      case GL_ALPHA_TO_COVERAGE_DITHER_ENABLE_NV:
+      case GL_ALPHA_TO_COVERAGE_DITHER_DISABLE_NV:
+         ctx->Multisample.SampleAlphaToCoverageDitherControl = mode;
+         break;
+      default:
+         _mesa_error(ctx, GL_INVALID_ENUM, "glAlphaToCoverageDitherControlNV(invalid parameter)");
+   }
+}
diff --git a/src/mesa/main/multisample.h b/src/mesa/main/multisample.h
index 49683cacdc9..9cd4724947a 100644
--- a/src/mesa/main/multisample.h
+++ b/src/mesa/main/multisample.h
@@ -58,4 +58,10 @@ _mesa_check_sample_count(struct gl_context *ctx, GLenum target,
                          GLenum internalFormat, GLsizei samples,
                          GLsizei storageSamples);
 
+extern void GLAPIENTRY
+_mesa_AlphaToCoverageDitherControlNV_no_error(GLenum mode);
+
+extern void GLAPIENTRY
+_mesa_AlphaToCoverageDitherControlNV(GLenum mode);
+
 #endif
diff --git a/src/mesa/main/tests/dispatch_sanity.cpp b/src/mesa/main/tests/dispatch_sanity.cpp
index 69dd56598e2..0fe3c9c348c 100644
--- a/src/mesa/main/tests/dispatch_sanity.cpp
+++ b/src/mesa/main/tests/dispatch_sanity.cpp
@@ -911,6 +911,10 @@ const struct function common_desktop_functions_possible[] = {
    { "glDepthRangeArrayv", 43, -1 },
    { "glDepthRangeIndexed", 43, -1 },
 
+/* GL 4.4 */
+   /* GL_NV_alpha_to_coverage_dither_control */
+   { "glAlphaToCoverageDitherControlNV", 44, -1 },
+
 /* GL 4.5 */
    /* aliased versions checked above */
    //{ "glGetGraphicsResetStatus", 45, -1 },
diff --git a/src/mesa/state_tracker/st_atom_blend.c b/src/mesa/state_tracker/st_atom_blend.c
index 10e9b6a38c4..35c99b9f089 100644
--- a/src/mesa/state_tracker/st_atom_blend.c
+++ b/src/mesa/state_tracker/st_atom_blend.c
@@ -287,6 +287,9 @@ st_update_blend( struct st_context *st )
        */
       blend->alpha_to_coverage = ctx->Multisample.SampleAlphaToCoverage;
       blend->alpha_to_one = ctx->Multisample.SampleAlphaToOne;
+      blend->alpha_to_coverage_dither =
+         ctx->Multisample.SampleAlphaToCoverageDitherControl !=
+         GL_ALPHA_TO_COVERAGE_DITHER_DISABLE_NV;
    }
 
    cso_set_blend(st->cso_context, blend);
diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
index 42d8a5b9f51..b0ee3e2210a 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -799,6 +799,7 @@ void st_init_extensions(struct pipe_screen *screen,
       { o(INTEL_conservative_rasterization), PIPE_CAP_CONSERVATIVE_RASTER_INNER_COVERAGE },
       { o(INTEL_shader_atomic_float_minmax), PIPE_CAP_ATOMIC_FLOAT_MINMAX              },
       { o(MESA_tile_raster_order),           PIPE_CAP_TILE_RASTER_ORDER                },
+      { o(NV_alpha_to_coverage_dither_control), PIPE_CAP_ALPHA_TO_COVERAGE_DITHER_CONTROL },
       { o(NV_compute_shader_derivatives),    PIPE_CAP_COMPUTE_SHADER_DERIVATIVES       },
       { o(NV_conditional_render),            PIPE_CAP_CONDITIONAL_RENDER               },
       { o(NV_fill_rectangle),                PIPE_CAP_POLYGON_MODE_FILL_RECTANGLE      },