diff options
Diffstat (limited to 'src/mesa/main/transformfeedback.c')
| -rw-r--r-- | src/mesa/main/transformfeedback.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/src/mesa/main/transformfeedback.c b/src/mesa/main/transformfeedback.c index d9c6e514e8f..b2818caa591 100644 --- a/src/mesa/main/transformfeedback.c +++ b/src/mesa/main/transformfeedback.c @@ -285,6 +285,7 @@ _mesa_BeginTransformFeedback(GLenum mode) struct gl_transform_feedback_object *obj; struct gl_transform_feedback_info *info; GLuint i; + unsigned vertices_per_prim; GET_CURRENT_CONTEXT(ctx); obj = ctx->TransformFeedback.CurrentObject; @@ -305,9 +306,13 @@ _mesa_BeginTransformFeedback(GLenum mode) switch (mode) { case GL_POINTS: + vertices_per_prim = 1; + break; case GL_LINES: + vertices_per_prim = 2; + break; case GL_TRIANGLES: - /* legal */ + vertices_per_prim = 3; break; default: _mesa_error(ctx, GL_INVALID_ENUM, "glBeginTransformFeedback(mode)"); @@ -333,6 +338,18 @@ _mesa_BeginTransformFeedback(GLenum mode) obj->Active = GL_TRUE; ctx->TransformFeedback.Mode = mode; + if (_mesa_is_gles3(ctx)) { + /* In GLES3, we are required to track the usage of the transform + * feedback buffer and report INVALID_OPERATION if a draw call tries to + * exceed it. So compute the maximum number of vertices that we can + * write without overflowing any of the buffers currently being used for + * feedback. + */ + unsigned max_vertices + = _mesa_compute_max_transform_feedback_vertices(obj, info); + obj->GlesRemainingPrims = max_vertices / vertices_per_prim; + } + assert(ctx->Driver.BeginTransformFeedback); ctx->Driver.BeginTransformFeedback(ctx, mode, obj); } |