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mesa: don't normalize spot light direction until validation time

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In glLight() we're only supposed to transform the direction by the modelview
matrix, not normalized it too.
This commit is contained in:
Brian Paul
2009-04-03 09:55:10 -06:00
parent be4c2d9a33
commit 650d147289
1 changed files with 7 additions and 2 deletions
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9
src/mesa/main/light.c
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@@ -209,7 +209,6 @@ _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:
@@ -1137,12 +1136,18 @@ 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 );
NORMALIZE_3FV( light->_NormDirection );
}
else {
GLfloat spotDir[3];
COPY_3V(spotDir, light->EyeDirection);
NORMALIZE_3FV(spotDir);
TRANSFORM_NORMAL( light->_NormDirection,
light->EyeDirection,
spotDir,
ctx->ModelviewMatrixStack.Top->m);
}