mesa: add support for ARB_indirect_parameters draw functions

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

1 files changed, 115 insertions, 0 deletions

diff --git a/src/mesa/main/api_validate.c b/src/mesa/main/api_validate.c
index d693ec6..2b62997 100644
--- a/src/mesa/main/api_validate.c
+++ b/src/mesa/main/api_validate.c
@@ -920,6 +920,121 @@ _mesa_validate_MultiDrawElementsIndirect(struct gl_context *ctx,
    return GL_TRUE;
 }
 
+static GLboolean
+valid_draw_indirect_parameters(struct gl_context *ctx,
+                               const char *name,
+                               GLintptr drawcount)
+{
+   /* From the ARB_indirect_parameters specification:
+    * "INVALID_VALUE is generated by MultiDrawArraysIndirectCountARB or
+    *  MultiDrawElementsIndirectCountARB if <drawcount> is not a multiple of
+    *  four."
+    */
+   if (drawcount & 3) {
+      _mesa_error(ctx, GL_INVALID_VALUE,
+                  "%s(drawcount is not a multiple of 4)", name);
+      return GL_FALSE;
+   }
+
+   /* From the ARB_indirect_parameters specification:
+    * "INVALID_OPERATION is generated by MultiDrawArraysIndirectCountARB or
+    *  MultiDrawElementsIndirectCountARB if no buffer is bound to the
+    *  PARAMETER_BUFFER_ARB binding point."
+    */
+   if (!_mesa_is_bufferobj(ctx->ParameterBuffer)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "%s: no buffer bound to PARAMETER_BUFFER", name);
+      return GL_FALSE;
+   }
+
+   if (_mesa_check_disallowed_mapping(ctx->ParameterBuffer)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "%s(PARAMETER_BUFFER is mapped)", name);
+      return GL_FALSE;
+   }
+
+   /* From the ARB_indirect_parameters specification:
+    * "INVALID_OPERATION is generated by MultiDrawArraysIndirectCountARB or
+    *  MultiDrawElementsIndirectCountARB if reading a <sizei> typed value
+    *  from the buffer bound to the PARAMETER_BUFFER_ARB target at the offset
+    *  specified by <drawcount> would result in an out-of-bounds access."
+    */
+   if (ctx->ParameterBuffer->Size < drawcount + sizeof(GLsizei)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "%s(PARAMETER_BUFFER too small)", name);
+      return GL_FALSE;
+   }
+
+   return GL_TRUE;
+}
+
+GLboolean
+_mesa_validate_MultiDrawArraysIndirectCount(struct gl_context *ctx,
+                                            GLenum mode,
+                                            GLintptr indirect,
+                                            GLintptr drawcount,
+                                            GLsizei maxdrawcount,
+                                            GLsizei stride)
+{
+   GLsizeiptr size = 0;
+   const unsigned drawArraysNumParams = 4;
+
+   FLUSH_CURRENT(ctx, 0);
+
+   /* caller has converted stride==0 to drawArraysNumParams * sizeof(GLuint) */
+   assert(stride != 0);
+
+   if (!valid_draw_indirect_multi(ctx, maxdrawcount, stride,
+                                  "glMultiDrawArraysIndirectCountARB"))
+      return GL_FALSE;
+
+   /* number of bytes of the indirect buffer which will be read */
+   size = maxdrawcount
+      ? (maxdrawcount - 1) * stride + drawArraysNumParams * sizeof(GLuint)
+      : 0;
+
+   if (!valid_draw_indirect(ctx, mode, (void *)indirect, size,
+                            "glMultiDrawArraysIndirectCountARB"))
+      return GL_FALSE;
+
+   return valid_draw_indirect_parameters(
+         ctx, "glMultiDrawArraysIndirectCountARB", drawcount);
+}
+
+GLboolean
+_mesa_validate_MultiDrawElementsIndirectCount(struct gl_context *ctx,
+                                              GLenum mode, GLenum type,
+                                              GLintptr indirect,
+                                              GLintptr drawcount,
+                                              GLsizei maxdrawcount,
+                                              GLsizei stride)
+{
+   GLsizeiptr size = 0;
+   const unsigned drawElementsNumParams = 5;
+
+   FLUSH_CURRENT(ctx, 0);
+
+   /* caller has converted stride==0 to drawElementsNumParams * sizeof(GLuint) */
+   assert(stride != 0);
+
+   if (!valid_draw_indirect_multi(ctx, maxdrawcount, stride,
+                                  "glMultiDrawElementsIndirectCountARB"))
+      return GL_FALSE;
+
+   /* number of bytes of the indirect buffer which will be read */
+   size = maxdrawcount
+      ? (maxdrawcount - 1) * stride + drawElementsNumParams * sizeof(GLuint)
+      : 0;
+
+   if (!valid_draw_indirect_elements(ctx, mode, type,
+                                     (void *)indirect, size,
+                                     "glMultiDrawElementsIndirectCountARB"))
+      return GL_FALSE;
+
+   return valid_draw_indirect_parameters(
+         ctx, "glMultiDrawElementsIndirectCountARB", drawcount);
+}
+
 static bool
 check_valid_to_compute(struct gl_context *ctx, const char *function)
 {