[Mesa-dev] [PATCH 05/46] mesa: add tessellation shader state and limits

[Marek Olšák]

From: Chris Forbes <chrisf at ijw.co.nz>

---
 src/mesa/main/config.h    | 8 ++++++++
 src/mesa/main/context.c   | 8 ++++++++
 src/mesa/main/mtypes.h    | 6 ++++++
 src/mesa/main/shaderapi.c | 7 +++++++
 4 files changed, 29 insertions(+)

diff --git a/src/mesa/main/config.h b/src/mesa/main/config.h
index 9c3baf4..833d8c0 100644
--- a/src/mesa/main/config.h
+++ b/src/mesa/main/config.h
@@ -294,6 +294,14 @@
 /** For GL_ARB_pipeline_statistics_query */
 #define MAX_PIPELINE_STATISTICS             11
 
+/** For GL_ARB_tessellation_shader */
+/*@{*/
+#define MAX_TESS_GEN_LEVEL 64
+#define MAX_PATCH_VERTICES 32
+#define MAX_TESS_PATCH_COMPONENTS 120
+#define MAX_TESS_CONTROL_TOTAL_OUTPUT_COMPONENTS 4096
+/*@}*/
+
 /*
  * Color channel component order
  * 
diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
index 4875f47..c86800a 100644
--- a/src/mesa/main/context.c
+++ b/src/mesa/main/context.c
@@ -726,6 +726,14 @@ _mesa_init_constants(struct gl_constants *consts, gl_api api)
 
    /** GL_KHR_context_flush_control */
    consts->ContextReleaseBehavior = GL_CONTEXT_RELEASE_BEHAVIOR_FLUSH;
+
+   /** GL_ARB_tessellation_shader */
+   consts->MaxTessGenLevel = MAX_TESS_GEN_LEVEL;
+   consts->MaxPatchVertices = MAX_PATCH_VERTICES;
+   consts->Program[MESA_SHADER_TESS_CTRL].MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
+   consts->Program[MESA_SHADER_TESS_EVAL].MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
+   consts->MaxTessPatchComponents = MAX_TESS_PATCH_COMPONENTS;
+   consts->MaxTessControlTotalOutputComponents = MAX_TESS_CONTROL_TOTAL_OUTPUT_COMPONENTS;
 }
 
 
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 12789f1..07a4b97 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -3681,6 +3681,12 @@ struct gl_constants
    GLenum ContextReleaseBehavior;
 
    struct gl_shader_compiler_options ShaderCompilerOptions[MESA_SHADER_STAGES];
+
+   /** GL_ARB_tessellation_shader */
+   GLuint MaxPatchVertices;
+   GLuint MaxTessGenLevel;
+   GLuint MaxTessPatchComponents;
+   GLuint MaxTessControlTotalOutputComponents;
 };
 
 
diff --git a/src/mesa/main/shaderapi.c b/src/mesa/main/shaderapi.c
index ea7917e..a247250 100644
--- a/src/mesa/main/shaderapi.c
+++ b/src/mesa/main/shaderapi.c
@@ -110,6 +110,7 @@ _mesa_init_shader_state(struct gl_context *ctx)
     */
    struct gl_shader_compiler_options options;
    gl_shader_stage sh;
+   int i;
 
    memset(&options, 0, sizeof(options));
    options.MaxUnrollIterations = 32;
@@ -126,6 +127,12 @@ _mesa_init_shader_state(struct gl_context *ctx)
    /* Extended for ARB_separate_shader_objects */
    ctx->Shader.RefCount = 1;
    mtx_init(&ctx->Shader.Mutex, mtx_plain);
+
+   ctx->TessCtrlProgram.patch_vertices = 3;
+   for (i = 0; i < 4; ++i)
+      ctx->TessCtrlProgram.patch_default_outer_level[i] = 1.0;
+   for (i = 0; i < 2; ++i)
+      ctx->TessCtrlProgram.patch_default_inner_level[i] = 1.0;
 }
 
 
-- 
2.1.0