mesa: add support for nvidia conservative rasterization extensions

Although the specs are written against compatibility GL 4.3 and allows core
profile and GLES2+, it is exposed for GL 1.0+ and GLES1 and GLES2+.

Signed-off-by: Rhys Perry <[email protected]>
Reviewed-by: Brian Paul <[email protected]>

1 files changed, 128 insertions, 0 deletions

diff --git a/src/mesa/main/conservativeraster.c b/src/mesa/main/conservativeraster.c
new file mode 100644
index 00000000000..9068a00b4c9
--- /dev/null
+++ b/src/mesa/main/conservativeraster.c
@@ -0,0 +1,128 @@
+/*
+ * Mesa 3-D graphics library
+ *
+ * Copyright (C) 2018 Rhys Perry
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/**
+ * \file conservativeraster.c
+ * glConservativeRasterParameteriNV and glConservativeRasterParameterfNV functions
+ */
+
+#include "conservativeraster.h"
+#include "context.h"
+#include "enums.h"
+
+static ALWAYS_INLINE void
+conservative_raster_parameter(GLenum pname, GLfloat param,
+                              bool no_error, const char *func)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   if (!no_error && !ctx->Extensions.NV_conservative_raster_dilate &&
+       !ctx->Extensions.NV_conservative_raster_pre_snap_triangles) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "%s not supported", func);
+      return;
+   }
+
+   if (MESA_VERBOSE & VERBOSE_API)
+      _mesa_debug(ctx, "%s(%s, %g)\n",
+                  func, _mesa_enum_to_string(pname), param);
+
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   switch (pname) {
+   case GL_CONSERVATIVE_RASTER_DILATE_NV:
+      if (!no_error && !ctx->Extensions.NV_conservative_raster_dilate)
+         goto invalid_pname_enum;
+
+      if (!no_error && param<0.0) {
+         _mesa_error(ctx, GL_INVALID_VALUE, "%s(param=%g)", func, param);
+         return;
+      }
+      ctx->ConservativeRasterDilate =
+         CLAMP(param,
+               ctx->Const.ConservativeRasterDilateRange[0],
+               ctx->Const.ConservativeRasterDilateRange[1]);
+      break;
+   case GL_CONSERVATIVE_RASTER_MODE_NV:
+      if (!no_error && !ctx->Extensions.NV_conservative_raster_pre_snap_triangles)
+         goto invalid_pname_enum;
+
+      if (!no_error && param != GL_CONSERVATIVE_RASTER_MODE_POST_SNAP_NV &&
+          param != GL_CONSERVATIVE_RASTER_MODE_PRE_SNAP_TRIANGLES_NV) {
+         _mesa_error(ctx, GL_INVALID_ENUM,
+                     "%s(pname=%s)", func, _mesa_enum_to_string(param));
+         return;
+      }
+      ctx->ConservativeRasterMode = param;
+      break;
+   default:
+      goto invalid_pname_enum;
+      break;
+   }
+
+   FLUSH_VERTICES(ctx, 0);
+   ctx->NewDriverState |=
+      ctx->DriverFlags.NewNvConservativeRasterizationParams;
+
+   return;
+invalid_pname_enum:
+   if (!no_error)
+      _mesa_error(ctx, GL_INVALID_ENUM, "%s(pname=%s)",
+                  func, _mesa_enum_to_string(pname));
+}
+
+void GLAPIENTRY
+_mesa_ConservativeRasterParameteriNV_no_error(GLenum pname, GLint param)
+{
+   conservative_raster_parameter(pname, param, true, 
+                                 "glConservativeRasterParameteriNV");
+}
+
+void GLAPIENTRY
+_mesa_ConservativeRasterParameteriNV(GLenum pname, GLint param)
+{
+   conservative_raster_parameter(pname, param, false,
+                                 "glConservativeRasterParameteriNV");
+}
+
+void GLAPIENTRY
+_mesa_ConservativeRasterParameterfNV_no_error(GLenum pname, GLfloat param)
+{
+   conservative_raster_parameter(pname, param, true, 
+                                 "glConservativeRasterParameterfNV");
+}
+
+void GLAPIENTRY
+_mesa_ConservativeRasterParameterfNV(GLenum pname, GLfloat param)
+{
+   conservative_raster_parameter(pname, param, false, 
+                                 "glConservativeRasterParameterfNV");
+}
+
+void
+_mesa_init_conservative_raster(struct gl_context *ctx)
+{
+   ctx->ConservativeRasterDilate = 0.0;
+   ctx->ConservativeRasterMode = GL_CONSERVATIVE_RASTER_MODE_POST_SNAP_NV;
+}