llvmpipe: implement support for multiple viewports

Largely related to making sure the rasterizer can correctly
pick out the correct scissor box for the current viewport.

Signed-off-by: Zack Rusin <[email protected]>
Reviewed-by: José Fonseca<[email protected]>
Reviewed-by: Brian Paul <[email protected]>
Reviewed-by: Roland Scheidegger <[email protected]>

1 files changed, 5 insertions, 2 deletions

diff --git a/src/gallium/drivers/llvmpipe/lp_context.h b/src/gallium/drivers/llvmpipe/lp_context.h
index d605dba2260..54f38303ae5 100644
--- a/src/gallium/drivers/llvmpipe/lp_context.h
+++ b/src/gallium/drivers/llvmpipe/lp_context.h
@@ -75,10 +75,10 @@ struct llvmpipe_context {
    struct pipe_constant_buffer constants[PIPE_SHADER_TYPES][LP_MAX_TGSI_CONST_BUFFERS];
    struct pipe_framebuffer_state framebuffer;
    struct pipe_poly_stipple poly_stipple;
-   struct pipe_scissor_state scissor;
+   struct pipe_scissor_state scissors[PIPE_MAX_VIEWPORTS];
    struct pipe_sampler_view *sampler_views[PIPE_SHADER_TYPES][PIPE_MAX_SHADER_SAMPLER_VIEWS];
 
-   struct pipe_viewport_state viewport;
+   struct pipe_viewport_state viewports[PIPE_MAX_VIEWPORTS];
    struct pipe_vertex_buffer vertex_buffer[PIPE_MAX_ATTRIBS];
    struct pipe_index_buffer index_buffer;
    struct pipe_resource *mapped_vs_tex[PIPE_MAX_SHADER_SAMPLER_VIEWS];
@@ -116,6 +116,9 @@ struct llvmpipe_context {
    /** Which vertex shader output slot contains point size */
    int psize_slot;
 
+   /** Which vertex shader output slot contains viewport index */
+   int viewport_index_slot;
+
    /**< minimum resolvable depth value, for polygon offset */   
    double mrd;