[Mesa-dev] [PATCH 11/31] mesa: Track enabled lights in a bitmask

[Mathias.Froehlich at gmx.net]

From: Mathias Fröhlich <mathias.froehlich at web.de>

This enables some optimizations afterwards.

Reviewed-by: Brian Paul <brianp at vmware.com>
Signed-off-by: Mathias Fröhlich <Mathias.Froehlich at web.de>
---
 src/mesa/main/enable.c | 2 ++
 src/mesa/main/light.c  | 1 +
 src/mesa/main/mtypes.h | 2 ++
 3 files changed, 5 insertions(+)

diff --git a/src/mesa/main/enable.c b/src/mesa/main/enable.c
index 1d674bf..bc59280 100644
--- a/src/mesa/main/enable.c
+++ b/src/mesa/main/enable.c
@@ -402,10 +402,12 @@ _mesa_set_enable(struct gl_context *ctx, GLenum cap, GLboolean state)
          FLUSH_VERTICES(ctx, _NEW_LIGHT);
          ctx->Light.Light[cap-GL_LIGHT0].Enabled = state;
          if (state) {
+            ctx->Light._EnabledLights |= 1u << (cap - GL_LIGHT0);
             insert_at_tail(&ctx->Light.EnabledList,
                            &ctx->Light.Light[cap-GL_LIGHT0]);
          }
          else {
+            ctx->Light._EnabledLights &= ~(1u << (cap - GL_LIGHT0));
             remove_from_list(&ctx->Light.Light[cap-GL_LIGHT0]);
          }
          break;
diff --git a/src/mesa/main/light.c b/src/mesa/main/light.c
index 4a8dee3..a52efdb 100644
--- a/src/mesa/main/light.c
+++ b/src/mesa/main/light.c
@@ -1171,6 +1171,7 @@ _mesa_init_lighting( struct gl_context *ctx )
    GLuint i;
 
    /* Lighting group */
+   ctx->Light._EnabledLights = 0;
    for (i = 0; i < MAX_LIGHTS; i++) {
       init_light( &ctx->Light.Light[i], i );
    }
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index d7dd6ec..f0128cd 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -630,6 +630,8 @@ struct gl_light_attrib
     * Derived state for optimizations: 
     */
    /*@{*/
+   GLbitfield _EnabledLights;	/**< bitmask containing enabled lights */
+
    GLboolean _NeedEyeCoords;		
    GLboolean _NeedVertices;		/**< Use fast shader? */
    struct gl_light EnabledList;         /**< List sentinel */
-- 
2.5.5