From 54c62ba5c36f3e2b279151f5df851d2ceee15319 Mon Sep 17 00:00:00 2001 From: Brian Paul Date: Wed, 28 Jan 2009 10:31:05 -0700 Subject: mesa: implement texture swizzling in swrast And enable GL_EXT_texture_swizzle for software drivers. --- src/mesa/swrast/s_fragprog.c | 39 +++++++++++++++++++++++++++++++-------- 1 file changed, 31 insertions(+), 8 deletions(-) (limited to 'src/mesa/swrast/s_fragprog.c') diff --git a/src/mesa/swrast/s_fragprog.c b/src/mesa/swrast/s_fragprog.c index 45ba91ff86d..58ef91ec010 100644 --- a/src/mesa/swrast/s_fragprog.c +++ b/src/mesa/swrast/s_fragprog.c @@ -32,6 +32,35 @@ #include "s_span.h" +/** + * Apply texture object's swizzle (X/Y/Z/W/0/1) to incoming 'texel' + * and return results in 'colorOut'. + */ +static INLINE void +swizzle_texel(const GLchan texel[4], GLfloat colorOut[4], GLuint swizzle) +{ + if (swizzle == SWIZZLE_NOOP) { + colorOut[0] = CHAN_TO_FLOAT(texel[0]); + colorOut[1] = CHAN_TO_FLOAT(texel[1]); + colorOut[2] = CHAN_TO_FLOAT(texel[2]); + colorOut[3] = CHAN_TO_FLOAT(texel[3]); + } + else { + GLfloat vector[6]; + vector[SWIZZLE_X] = CHAN_TO_FLOAT(texel[0]); + vector[SWIZZLE_Y] = CHAN_TO_FLOAT(texel[1]); + vector[SWIZZLE_Z] = CHAN_TO_FLOAT(texel[2]); + vector[SWIZZLE_W] = CHAN_TO_FLOAT(texel[3]); + vector[SWIZZLE_ZERO] = 0.0F; + vector[SWIZZLE_ONE] = 1.0F; + colorOut[0] = vector[GET_SWZ(swizzle, 0)]; + colorOut[1] = vector[GET_SWZ(swizzle, 1)]; + colorOut[2] = vector[GET_SWZ(swizzle, 2)]; + colorOut[3] = vector[GET_SWZ(swizzle, 3)]; + } +} + + /** * Fetch a texel with given lod. * Called via machine->FetchTexelLod() @@ -52,10 +81,7 @@ fetch_texel_lod( GLcontext *ctx, const GLfloat texcoord[4], GLfloat lambda, swrast->TextureSample[unit](ctx, texObj, 1, (const GLfloat (*)[4]) texcoord, &lambda, &rgba); - color[0] = CHAN_TO_FLOAT(rgba[0]); - color[1] = CHAN_TO_FLOAT(rgba[1]); - color[2] = CHAN_TO_FLOAT(rgba[2]); - color[3] = CHAN_TO_FLOAT(rgba[3]); + swizzle_texel(rgba, color, texObj->_Swizzle); } else { color[0] = color[1] = color[2] = color[3] = 0.0F; @@ -97,10 +123,7 @@ fetch_texel_deriv( GLcontext *ctx, const GLfloat texcoord[4], swrast->TextureSample[unit](ctx, texObj, 1, (const GLfloat (*)[4]) texcoord, &lambda, &rgba); - color[0] = CHAN_TO_FLOAT(rgba[0]); - color[1] = CHAN_TO_FLOAT(rgba[1]); - color[2] = CHAN_TO_FLOAT(rgba[2]); - color[3] = CHAN_TO_FLOAT(rgba[3]); + swizzle_texel(rgba, color, texObj->_Swizzle); } else { color[0] = color[1] = color[2] = color[3] = 0.0F; -- cgit v1.2.3