added _mesa_unconvert_teximage()
This commit is contained in:
Brian Paul
@@ -1,4 +1,4 @@
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/* $Id: texutil.c,v 1.1 2000/03/24 20:54:21 brianp Exp $ */
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/* $Id: texutil.c,v 1.2 2000/03/27 18:56:26 brianp Exp $ */
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/*
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* Mesa 3-D graphics library
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@@ -29,6 +29,7 @@
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#include "all.h"
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#else
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#include "glheader.h"
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#include "context.h"
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#include "image.h"
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#include "mem.h"
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#include "texutil.h"
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@@ -535,3 +536,285 @@ _mesa_convert_teximage(MesaIntTexFormat dstFormat,
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}
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return GL_TRUE;
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}
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/*
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* Used to convert 16-bit texels into GLubyte color components.
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*/
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static GLubyte R5G6B5toRed[0xffff];
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static GLubyte R5G6B5toGreen[0xffff];
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static GLubyte R5G6B5toBlue[0xffff];
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static GLubyte A4R4G4B4toRed[0xffff];
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static GLubyte A4R4G4B4toGreen[0xffff];
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static GLubyte A4R4G4B4toBlue[0xffff];
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static GLubyte A4R4G4B4toAlpha[0xffff];
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static GLubyte A1R5G5B5toRed[0xffff];
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static GLubyte A1R5G5B5toGreen[0xffff];
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static GLubyte A1R5G5B5toBlue[0xffff];
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static GLubyte A1R5G5B5toAlpha[0xffff];
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static void
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generate_lookup_tables(void)
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{
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GLint i;
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for (i = 0; i <= 0xffff; i++) {
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GLint r = (i >> 8) & 0xf8;
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GLint g = (i >> 3) & 0xfc;
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GLint b = (i << 3) & 0xf8;
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r = r * 255 / 0xf8;
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g = g * 255 / 0xfc;
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b = b * 255 / 0xf8;
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R5G6B5toRed[i] = r;
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R5G6B5toGreen[i] = g;
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R5G6B5toBlue[i] = b;
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}
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for (i = 0; i <= 0xffff; i++) {
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GLint r = (i >> 8) & 0xf;
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GLint g = (i >> 4) & 0xf;
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GLint b = (i ) & 0xf;
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GLint a = (i >> 12) & 0xf;
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r = r * 255 / 0xf;
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g = g * 255 / 0xf;
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b = b * 255 / 0xf;
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a = a * 255 / 0xf;
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A4R4G4B4toRed[i] = r;
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A4R4G4B4toGreen[i] = g;
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A4R4G4B4toBlue[i] = b;
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A4R4G4B4toAlpha[i] = b;
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}
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for (i = 0; i <= 0xffff; i++) {
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GLint r = (i >> 10) & 0xf8;
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GLint g = (i >> 5) & 0xf8;
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GLint b = (i ) & 0xf8;
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GLint a = (i >> 15) & 0x1;
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r = r * 255 / 0xf8;
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g = g * 255 / 0xf8;
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b = b * 255 / 0xf8;
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a = a * 255;
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A1R5G5B5toRed[i] = r;
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A1R5G5B5toGreen[i] = g;
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A1R5G5B5toBlue[i] = b;
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A1R5G5B5toAlpha[i] = b;
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}
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}
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/*
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* Convert a texture image from an internal format to one of Mesa's
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* core internal formats. This is likely to be used by glGetTexImage
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* and for fetching texture images when falling back to software rendering.
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*
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* Notes:
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* This function will do power of two image down-scaling to accomodate
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* drivers with limited texture image aspect ratios.
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* The implicit dest data type is GL_UNSIGNED_BYTE.
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*/
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void
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_mesa_unconvert_teximage(MesaIntTexFormat srcFormat,
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GLint srcWidth, GLint srcHeight,
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const GLvoid *srcImage,
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GLsizei dstWidth, GLsizei dstHeight,
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GLenum dstFormat, GLubyte *dstImage)
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{
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static GLboolean firstCall = GL_TRUE;
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const GLint wScale = srcWidth / dstWidth; /* must be power of two */
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const GLint hScale = srcHeight / dstHeight; /* must be power of two */
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ASSERT(srcWidth >= dstWidth);
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ASSERT(srcHeight >= dstHeight);
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ASSERT(dstImage);
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ASSERT(srcImage);
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if (firstCall) {
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generate_lookup_tables();
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firstCall = GL_FALSE;
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}
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switch (srcFormat) {
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case MESA_I8:
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case MESA_L8:
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case MESA_A8:
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case MESA_C8:
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#ifdef DEBUG
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if (srcFormat == MESA_I8) {
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ASSERT(dstFormat == GL_INTENSITY);
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}
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else if (srcFormat == MESA_L8) {
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ASSERT(dstFormat == GL_LUMINANCE);
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}
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else if (srcFormat == MESA_A8) {
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ASSERT(dstFormat == GL_ALPHA);
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}
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else if (srcFormat == MESA_C8) {
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ASSERT(dstFormat == GL_COLOR_INDEX);
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}
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#endif
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if (wScale == 1 && hScale == 1) {
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/* easy! */
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MEMCPY(dstImage, srcImage, dstWidth * dstHeight * sizeof(GLubyte));
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}
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else {
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/* rescale */
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const GLubyte *src8 = (const GLubyte *) srcImage;
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GLint row, col;
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for (row = 0; row < dstHeight; row++) {
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GLint srcRow = row * hScale;
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for (col = 0; col < dstWidth; col++) {
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GLint srcCol = col * wScale;
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*dstImage++ = src8[srcRow * srcWidth + srcCol];
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}
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}
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}
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break;
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case MESA_L8_A8:
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ASSERT(dstFormat == GL_LUMINANCE_ALPHA);
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if (wScale == 1 && hScale == 1) {
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GLint i, n = dstWidth * dstHeight;
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const GLushort *texel = (const GLushort *) srcImage;
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for (i = 0; i < n; i++) {
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const GLushort tex = *texel++;
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*dstImage++ = (tex >> 8); /* luminance */
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*dstImage++ = (tex & 0xff); /* alpha */
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}
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}
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else {
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/* rescale */
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const GLushort *src16 = (const GLushort *) srcImage;
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GLint row, col;
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for (row = 0; row < dstHeight; row++) {
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GLint srcRow = row * hScale;
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for (col = 0; col < dstWidth; col++) {
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GLint srcCol = col * wScale;
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const GLushort tex = src16[srcRow * srcWidth + srcCol];
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*dstImage++ = (tex >> 8); /* luminance */
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*dstImage++ = (tex & 0xff); /* alpha */
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}
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}
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}
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break;
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case MESA_R5_G6_B5:
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ASSERT(dstFormat == GL_RGB);
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if (wScale == 1 && hScale == 1) {
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GLint i, n = dstWidth * dstHeight;
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const GLushort *texel = (const GLushort *) srcImage;
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for (i = 0; i < n; i++) {
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const GLushort tex = *texel++;
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*dstImage++ = R5G6B5toRed[tex];
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*dstImage++ = R5G6B5toGreen[tex];
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*dstImage++ = R5G6B5toBlue[tex];
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}
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}
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else {
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/* rescale */
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const GLushort *src16 = (const GLushort *) srcImage;
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GLint row, col;
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for (row = 0; row < dstHeight; row++) {
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GLint srcRow = row * hScale;
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for (col = 0; col < dstWidth; col++) {
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GLint srcCol = col * wScale;
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const GLushort tex = src16[srcRow * srcWidth + srcCol];
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*dstImage++ = R5G6B5toRed[tex];
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*dstImage++ = R5G6B5toGreen[tex];
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*dstImage++ = R5G6B5toBlue[tex];
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}
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}
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}
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break;
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case MESA_A4_R4_G4_B4:
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ASSERT(dstFormat == GL_RGBA);
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if (wScale == 1 && hScale == 1) {
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GLint i, n = dstWidth * dstHeight;
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const GLushort *texel = (const GLushort *) srcImage;
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for (i = 0; i < n; i++) {
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const GLushort tex = *texel++;
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*dstImage++ = A4R4G4B4toRed[tex];
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*dstImage++ = A4R4G4B4toGreen[tex];
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*dstImage++ = A4R4G4B4toBlue[tex];
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*dstImage++ = A4R4G4B4toAlpha[tex];
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}
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}
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else {
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/* rescale */
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const GLushort *src16 = (const GLushort *) srcImage;
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GLint row, col;
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for (row = 0; row < dstHeight; row++) {
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GLint srcRow = row * hScale;
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for (col = 0; col < dstWidth; col++) {
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GLint srcCol = col * wScale;
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const GLushort tex = src16[srcRow * srcWidth + srcCol];
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*dstImage++ = A4R4G4B4toRed[tex];
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*dstImage++ = A4R4G4B4toGreen[tex];
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*dstImage++ = A4R4G4B4toBlue[tex];
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*dstImage++ = A4R4G4B4toAlpha[tex];
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}
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}
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}
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break;
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case MESA_A1_R5_G5_B5:
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ASSERT(dstFormat == GL_RGBA);
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if (wScale == 1 && hScale == 1) {
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GLint i, n = dstWidth * dstHeight;
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const GLushort *texel = (const GLushort *) srcImage;
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for (i = 0; i < n; i++) {
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const GLushort tex = *texel++;
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*dstImage++ = A1R5G5B5toRed[tex];
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*dstImage++ = A1R5G5B5toGreen[tex];
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*dstImage++ = A1R5G5B5toBlue[tex];
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*dstImage++ = A1R5G5B5toAlpha[tex];
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}
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}
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else {
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/* rescale */
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const GLushort *src16 = (const GLushort *) srcImage;
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GLint row, col;
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for (row = 0; row < dstHeight; row++) {
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GLint srcRow = row * hScale;
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for (col = 0; col < dstWidth; col++) {
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GLint srcCol = col * wScale;
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const GLushort tex = src16[srcRow * srcWidth + srcCol];
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*dstImage++ = A1R5G5B5toRed[tex];
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*dstImage++ = A1R5G5B5toGreen[tex];
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*dstImage++ = A1R5G5B5toBlue[tex];
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*dstImage++ = A1R5G5B5toAlpha[tex];
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}
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}
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}
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break;
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case MESA_A8_R8_G8_B8:
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ASSERT(dstFormat == GL_RGBA);
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if (wScale == 1 && hScale == 1) {
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GLint i, n = dstWidth * dstHeight;
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const GLushort *texel = (const GLushort *) srcImage;
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for (i = 0; i < n; i++) {
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const GLuint tex = *texel++;
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*dstImage++ = (tex >> 16) & 0xff; /* R */
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*dstImage++ = (tex >> 8) & 0xff; /* G */
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*dstImage++ = (tex ) & 0xff; /* B */
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*dstImage++ = (tex >> 24) & 0xff; /* A */
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}
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}
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else {
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/* rescale */
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const GLushort *src16 = (const GLushort *) srcImage;
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GLint row, col;
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for (row = 0; row < dstHeight; row++) {
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GLint srcRow = row * hScale;
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for (col = 0; col < dstWidth; col++) {
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GLint srcCol = col * wScale;
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const GLuint tex = src16[srcRow * srcWidth + srcCol];
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*dstImage++ = (tex >> 16) & 0xff; /* R */
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*dstImage++ = (tex >> 8) & 0xff; /* G */
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*dstImage++ = (tex ) & 0xff; /* B */
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*dstImage++ = (tex >> 24) & 0xff; /* A */
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}
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}
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}
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break;
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default:
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gl_problem(NULL, "bad srcFormat in _mesa_uncovert_teximage()");
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}
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}
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@@ -1,4 +1,4 @@
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/* $Id: texutil.h,v 1.1 2000/03/24 20:54:21 brianp Exp $ */
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/* $Id: texutil.h,v 1.2 2000/03/27 18:56:26 brianp Exp $ */
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/*
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* Mesa 3-D graphics library
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@@ -58,5 +58,13 @@ _mesa_convert_teximage(MesaIntTexFormat dstFormat,
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const struct gl_pixelstore_attrib *packing);
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extern void
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_mesa_unconvert_teximage(MesaIntTexFormat srcFormat,
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GLint srcWidth, GLint srcHeight,
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const GLvoid *srcImage,
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GLsizei dstWidth, GLsizei dstHeight,
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GLenum dstFormat, GLubyte *dstImage);
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#endif
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