Merge commit 'mesa_7_6_branch' into mesa_7_7_branch

[mesa.git] / src / mesa / main / light.c

diff --git a/src/mesa/main/light.c b/src/mesa/main/light.c
index a15c1f0be0513e89d50964f0844c1ca52466cf5d..1c8a081e9a66583f731da9e938af5fd6838ce5ef 100644 (file)
--- a/src/mesa/main/light.c
+++ b/src/mesa/main/light.c
@@ -1,8 +1,9 @@
 /*
  * Mesa 3-D graphics library
- * Version:  7.0
+ * Version:  7.5
  *
- * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
+ * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
+ * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -63,6 +64,37 @@ _mesa_ShadeModel( GLenum mode )
 }
 
 
+/**
+ * Set the provoking vertex (the vertex which specifies the prim's
+ * color when flat shading) to either the first or last vertex of the
+ * triangle or line.
+ */
+void GLAPIENTRY
+_mesa_ProvokingVertexEXT(GLenum mode)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   if (MESA_VERBOSE&VERBOSE_API)
+      _mesa_debug(ctx, "glProvokingVertexEXT 0x%x\n", mode);
+
+   switch (mode) {
+   case GL_FIRST_VERTEX_CONVENTION_EXT:
+   case GL_LAST_VERTEX_CONVENTION_EXT:
+      break;
+   default:
+      _mesa_error(ctx, GL_INVALID_ENUM, "glProvokingVertexEXT(0x%x)", mode);
+      return;
+   }
+
+   if (ctx->Light.ProvokingVertex == mode)
+      return;
+
+   FLUSH_VERTICES(ctx, _NEW_LIGHT);
+   ctx->Light.ProvokingVertex = mode;
+}
+
+
 /**
  * Helper function called by _mesa_Lightfv and _mesa_PopAttrib to set
  * per-light state.
@@ -110,10 +142,10 @@ _mesa_light(GLcontext *ctx, GLuint lnum, GLenum pname, const GLfloat *params)
       break;
    case GL_SPOT_DIRECTION:
       /* NOTE: Direction already transformed by inverse ModelView! */
-      if (TEST_EQ_3V(light->EyeDirection, params))
+      if (TEST_EQ_3V(light->SpotDirection, params))
         return;
       FLUSH_VERTICES(ctx, _NEW_LIGHT);
-      COPY_3V(light->EyeDirection, params);
+      COPY_3V(light->SpotDirection, params);
       break;
    case GL_SPOT_EXPONENT:
       ASSERT(params[0] >= 0.0);
@@ -209,7 +241,6 @@ _mesa_Lightfv( GLenum light, GLenum pname, const GLfloat *params )
         _math_matrix_analyse(ctx->ModelviewMatrixStack.Top);
       }
       TRANSFORM_DIRECTION(temp, params, ctx->ModelviewMatrixStack.Top->m);
-      NORMALIZE_3FV(temp);
       params = temp;
       break;
    case GL_SPOT_EXPONENT:
@@ -326,7 +357,7 @@ _mesa_GetLightfv( GLenum light, GLenum pname, GLfloat *params )
          COPY_4V( params, ctx->Light.Light[l].EyePosition );
          break;
       case GL_SPOT_DIRECTION:
-         COPY_3V( params, ctx->Light.Light[l].EyeDirection );
+         COPY_3V( params, ctx->Light.Light[l].SpotDirection );
          break;
       case GL_SPOT_EXPONENT:
          params[0] = ctx->Light.Light[l].SpotExponent;
@@ -388,9 +419,9 @@ _mesa_GetLightiv( GLenum light, GLenum pname, GLint *params )
          params[3] = (GLint) ctx->Light.Light[l].EyePosition[3];
          break;
       case GL_SPOT_DIRECTION:
-         params[0] = (GLint) ctx->Light.Light[l].EyeDirection[0];
-         params[1] = (GLint) ctx->Light.Light[l].EyeDirection[1];
-         params[2] = (GLint) ctx->Light.Light[l].EyeDirection[2];
+         params[0] = (GLint) ctx->Light.Light[l].SpotDirection[0];
+         params[1] = (GLint) ctx->Light.Light[l].SpotDirection[1];
+         params[2] = (GLint) ctx->Light.Light[l].SpotDirection[2];
          break;
       case GL_SPOT_EXPONENT:
          params[0] = (GLint) ctx->Light.Light[l].SpotExponent;
@@ -497,7 +528,7 @@ _mesa_LightModeliv( GLenum pname, const GLint *params )
          break;
       default:
          /* Error will be caught later in gl_LightModelfv */
-         ;
+         ASSIGN_4V(fparam, 0.0F, 0.0F, 0.0F, 0.0F);
    }
    _mesa_LightModelfv( pname, fparam );
 }
@@ -605,7 +636,7 @@ _mesa_update_material( GLcontext *ctx, GLuint bitmask )
    struct gl_light *light, *list = &ctx->Light.EnabledList;
    GLfloat (*mat)[4] = ctx->Light.Material.Attrib;
 
-   if (MESA_VERBOSE&VERBOSE_IMMEDIATE) 
+   if (MESA_VERBOSE & VERBOSE_MATERIAL) 
       _mesa_debug(ctx, "_mesa_update_material, mask 0x%x\n", bitmask);
 
    if (!bitmask)
@@ -1137,20 +1168,26 @@ compute_light_positions( GLcontext *ctx )
       }
 
       if (light->_Flags & LIGHT_SPOT) {
+         /* Note: we normalize the spot direction now */
+
         if (ctx->_NeedEyeCoords) {
-           COPY_3V( light->_NormDirection, light->EyeDirection );
+           COPY_3V( light->_NormSpotDirection, light->SpotDirection );
+            NORMALIZE_3FV( light->_NormSpotDirection );
         }
          else {
-           TRANSFORM_NORMAL( light->_NormDirection,
-                             light->EyeDirection,
+            GLfloat spotDir[3];
+            COPY_3V(spotDir, light->SpotDirection);
+            NORMALIZE_3FV(spotDir);
+           TRANSFORM_NORMAL( light->_NormSpotDirection,
+                             spotDir,
                              ctx->ModelviewMatrixStack.Top->m);
         }
 
-        NORMALIZE_3FV( light->_NormDirection );
+        NORMALIZE_3FV( light->_NormSpotDirection );
 
         if (!(light->_Flags & LIGHT_POSITIONAL)) {
            GLfloat PV_dot_dir = - DOT3(light->_VP_inf_norm,
-                                       light->_NormDirection);
+                                       light->_NormSpotDirection);
 
            if (PV_dot_dir > light->_CosCutoff) {
               double x = PV_dot_dir * (EXP_TABLE_SIZE-1);
@@ -1219,15 +1256,15 @@ _mesa_update_tnl_spaces( GLcontext *ctx, GLuint new_state )
         ctx->Driver.LightingSpaceChange( ctx );
    }
    else {
-      GLuint new_state = ctx->NewState;
+      GLuint new_state2 = ctx->NewState;
 
       /* Recalculate that same state only if it has been invalidated
        * by other statechanges.
        */
-      if (new_state & _NEW_MODELVIEW)
+      if (new_state2 & _NEW_MODELVIEW)
         update_modelview_scale(ctx);
 
-      if (new_state & (_NEW_LIGHT|_NEW_MODELVIEW))
+      if (new_state2 & (_NEW_LIGHT|_NEW_MODELVIEW))
         compute_light_positions( ctx );
    }
 }
@@ -1274,7 +1311,7 @@ init_light( struct gl_light *l, GLuint n )
       ASSIGN_4V( l->Specular, 0.0, 0.0, 0.0, 1.0 );
    }
    ASSIGN_4V( l->EyePosition, 0.0, 0.0, 1.0, 0.0 );
-   ASSIGN_3V( l->EyeDirection, 0.0, 0.0, -1.0 );
+   ASSIGN_3V( l->SpotDirection, 0.0, 0.0, -1.0 );
    l->SpotExponent = 0.0;
    _mesa_invalidate_spot_exp_table( l );
    l->SpotCutoff = 180.0;
@@ -1343,6 +1380,7 @@ _mesa_init_lighting( GLcontext *ctx )
    init_lightmodel( &ctx->Light.Model );
    init_material( &ctx->Light.Material );
    ctx->Light.ShadeModel = GL_SMOOTH;
+   ctx->Light.ProvokingVertex = GL_LAST_VERTEX_CONVENTION_EXT;
    ctx->Light.Enabled = GL_FALSE;
    ctx->Light.ColorMaterialFace = GL_FRONT_AND_BACK;
    ctx->Light.ColorMaterialMode = GL_AMBIENT_AND_DIFFUSE;