From c740a7da6142a9d7c4affddba519b75d47de24fd Mon Sep 17 00:00:00 2001 From: Brian Paul Date: Tue, 2 Feb 2010 18:50:19 -0700 Subject: draw: new, updated comments Try to avoid future confusion between different, but similar functions. --- src/gallium/auxiliary/draw/draw_context.c | 24 ++++++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-) (limited to 'src/gallium/auxiliary') diff --git a/src/gallium/auxiliary/draw/draw_context.c b/src/gallium/auxiliary/draw/draw_context.c index d3084fd428..15ba788f00 100644 --- a/src/gallium/auxiliary/draw/draw_context.c +++ b/src/gallium/auxiliary/draw/draw_context.c @@ -352,7 +352,10 @@ draw_find_shader_output(const struct draw_context *draw, /** - * Return number of the shader outputs. + * Return total number of the shader outputs. This function is similar to + * draw_current_shader_outputs() but this function also counts any extra + * vertex/geometry output attributes that may be filled in by some draw + * stages (such as AA point, AA line). * * If geometry shader is present, its output will be returned, * if not vertex shader is used. @@ -362,8 +365,9 @@ draw_num_shader_outputs(const struct draw_context *draw) { uint count = draw->vs.vertex_shader->info.num_outputs; - /* if geometry shader is present, its outputs go to te - * driver, not the vertex shaders */ + /* If a geometry shader is present, its outputs go to the + * driver, else the vertex shader's outputs. + */ if (draw->gs.geometry_shader) count = draw->gs.geometry_shader->info.num_outputs; @@ -374,7 +378,8 @@ draw_num_shader_outputs(const struct draw_context *draw) /** - * Provide TGSI sampler objects for vertex/geometry shaders that use texture fetches. + * Provide TGSI sampler objects for vertex/geometry shaders that use + * texture fetches. * This might only be used by software drivers for the time being. */ void @@ -454,6 +459,12 @@ void draw_do_flush( struct draw_context *draw, unsigned flags ) } +/** + * Return the number of output attributes produced by the geometry + * shader, if present. If no geometry shader, return the number of + * outputs from the vertex shader. + * \sa draw_num_shader_outputs + */ int draw_current_shader_outputs(struct draw_context *draw) { if (draw->gs.geometry_shader) @@ -461,6 +472,11 @@ int draw_current_shader_outputs(struct draw_context *draw) return draw->vs.num_vs_outputs; } + +/** + * Return the index of the shader output which will contain the + * vertex position. + */ int draw_current_shader_position_output(struct draw_context *draw) { if (draw->gs.geometry_shader) -- cgit v1.2.3