diff options
Diffstat (limited to 'src/mesa/drivers/dri/i965/brw_shader.cpp')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_shader.cpp | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_shader.cpp b/src/mesa/drivers/dri/i965/brw_shader.cpp index 15f7393..0f743fb 100644 --- a/src/mesa/drivers/dri/i965/brw_shader.cpp +++ b/src/mesa/drivers/dri/i965/brw_shader.cpp @@ -1227,3 +1227,29 @@ brw_setup_image_uniform_values(gl_shader_stage stage, stage_prog_data->binding_table.image_start + image_idx); } } + +/** + * Decide which set of clip planes should be used when clipping via + * gl_Position or gl_ClipVertex. + */ +gl_clip_plane *brw_select_clip_planes(struct gl_context *ctx) +{ + if (ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX]) { + /* There is currently a GLSL vertex shader, so clip according to GLSL + * rules, which means compare gl_ClipVertex (or gl_Position, if + * gl_ClipVertex wasn't assigned) against the eye-coordinate clip planes + * that were stored in EyeUserPlane at the time the clip planes were + * specified. + */ + return ctx->Transform.EyeUserPlane; + } else { + /* Either we are using fixed function or an ARB vertex program. In + * either case the clip planes are going to be compared against + * gl_Position (which is in clip coordinates) so we have to clip using + * _ClipUserPlane, which was transformed into clip coordinates by Mesa + * core. + */ + return ctx->Transform._ClipUserPlane; + } +} + |