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Diffstat (limited to 'src/mesa/drivers/dri/mga/mgatexcnv.c')
-rw-r--r--src/mesa/drivers/dri/mga/mgatexcnv.c256
1 files changed, 256 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/mga/mgatexcnv.c b/src/mesa/drivers/dri/mga/mgatexcnv.c
new file mode 100644
index 0000000000..3a05c7d3eb
--- /dev/null
+++ b/src/mesa/drivers/dri/mga/mgatexcnv.c
@@ -0,0 +1,256 @@
+/* $XFree86: xc/lib/GL/mesa/src/drv/mga/mgatexcnv.c,v 1.3 2002/10/30 12:51:36 alanh Exp $ */
+/*
+ * Copyright 2000-2001 VA Linux Systems, 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"),
+ * to deal in the Software without restriction, including without limitation
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, and/or sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ * Keith Whitwell <keith@tungstengraphics.com>
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <GL/gl.h>
+
+#include "mm.h"
+#include "mgacontext.h"
+#include "mgatex.h"
+
+
+/*
+ * mgaConvertTexture
+ * Converts a mesa format texture to the appropriate hardware format
+ * Note that sometimes width may be larger than the texture, like 64x1
+ * for an 8x8 texture. This happens when we have to crutch the pitch
+ * limits of the mga by uploading a block of texels as a single line.
+ */
+void mgaConvertTexture( GLuint *destPtr, int texelBytes,
+ struct gl_texture_image *image,
+ int x, int y, int width, int height )
+{
+ register int i, j;
+ GLubyte *src;
+ int stride;
+
+ if (0)
+ fprintf(stderr, "texture image %p\n", image->Data);
+
+ if (image->Data == 0)
+ return;
+
+ /* FIXME: g400 luminance_alpha internal format */
+ switch (texelBytes) {
+ case 1:
+ switch (image->Format) {
+ case GL_COLOR_INDEX:
+ case GL_INTENSITY:
+ case GL_LUMINANCE:
+ case GL_ALPHA:
+ src = (GLubyte *)image->Data + ( y * image->Width + x );
+ stride = (image->Width - width);
+ for ( i = height ; i ; i-- ) {
+ for ( j = width >> 2 ; j ; j-- ) {
+
+ *destPtr++ = src[0] | ( src[1] << 8 ) | ( src[2] << 16 ) | ( src[3] << 24 );
+ src += 4;
+ }
+ src += stride;
+ }
+ break;
+ default:
+ goto format_error;
+ }
+ break;
+ case 2:
+ switch (image->Format) {
+ case GL_RGB:
+ src = (GLubyte *)image->Data + ( y * image->Width + x ) * 3;
+ stride = (image->Width - width) * 3;
+ for ( i = height ; i ; i-- ) {
+ for ( j = width >> 1 ; j ; j-- ) {
+
+ *destPtr++ = MGAPACKCOLOR565(src[0],src[1],src[2]) |
+ ( MGAPACKCOLOR565(src[3],src[4],src[5]) << 16 );
+ src += 6;
+ }
+ src += stride;
+ }
+ break;
+ case GL_RGBA:
+ src = (GLubyte *)image->Data + ( y * image->Width + x ) * 4;
+ stride = (image->Width - width) * 4;
+ for ( i = height ; i ; i-- ) {
+ for ( j = width >> 1 ; j ; j-- ) {
+
+ *destPtr++ = MGAPACKCOLOR4444(src[0],src[1],src[2],src[3]) |
+ ( MGAPACKCOLOR4444(src[4],src[5],src[6],src[7]) << 16 );
+ src += 8;
+ }
+ src += stride;
+ }
+ break;
+ case GL_LUMINANCE:
+ src = (GLubyte *)image->Data + ( y * image->Width + x );
+ stride = (image->Width - width);
+ for ( i = height ; i ; i-- ) {
+ for ( j = width >> 1 ; j ; j-- ) {
+ /* FIXME: should probably use 555 texture to get true grey */
+ *destPtr++ = MGAPACKCOLOR565(src[0],src[0],src[0]) |
+ ( MGAPACKCOLOR565(src[1],src[1],src[1]) << 16 );
+ src += 2;
+ }
+ src += stride;
+ }
+ break;
+ case GL_INTENSITY:
+ src = (GLubyte *)image->Data + ( y * image->Width + x );
+ stride = (image->Width - width);
+ for ( i = height ; i ; i-- ) {
+ for ( j = width >> 1 ; j ; j-- ) {
+
+ *destPtr++ = MGAPACKCOLOR4444(src[0],src[0],src[0],src[0]) |
+ ( MGAPACKCOLOR4444(src[1],src[1],src[1],src[1]) << 16 );
+ src += 2;
+ }
+ src += stride;
+ }
+ break;
+ case GL_ALPHA:
+ src = (GLubyte *)image->Data + ( y * image->Width + x );
+ stride = (image->Width - width);
+ for ( i = height ; i ; i-- ) {
+ for ( j = width >> 1 ; j ; j-- ) {
+
+ *destPtr++ = MGAPACKCOLOR4444(255,255,255,src[0]) |
+ ( MGAPACKCOLOR4444(255,255,255,src[1]) << 16 );
+ src += 2;
+ }
+ src += stride;
+ }
+ break;
+ case GL_LUMINANCE_ALPHA:
+ src = (GLubyte *)image->Data + ( y * image->Width + x ) * 2;
+ stride = (image->Width - width) * 2;
+ for ( i = height ; i ; i-- ) {
+ for ( j = width >> 1 ; j ; j-- ) {
+
+ *destPtr++ = MGAPACKCOLOR4444(src[0],src[0],src[0],src[1]) |
+ ( MGAPACKCOLOR4444(src[2],src[2],src[2],src[3]) << 16 );
+ src += 4;
+ }
+ src += stride;
+ }
+ break;
+ default:
+ goto format_error;
+ }
+ break;
+ case 4:
+ switch (image->Format) {
+ case GL_RGB:
+ src = (GLubyte *)image->Data + ( y * image->Width + x ) * 3;
+ stride = (image->Width - width) * 3;
+ for ( i = height ; i ; i-- ) {
+ for ( j = width ; j ; j-- ) {
+
+ *destPtr++ = MGAPACKCOLOR8888(src[0],src[1],src[2], 255);
+ src += 3;
+ }
+ src += stride;
+ }
+ break;
+ case GL_RGBA:
+ src = (GLubyte *)image->Data + ( y * image->Width + x ) * 4;
+ stride = (image->Width - width) * 4;
+ for ( i = height ; i ; i-- ) {
+ for ( j = width ; j ; j-- ) {
+
+ *destPtr++ = MGAPACKCOLOR8888(src[0],src[1],src[2],src[3]);
+ src += 4;
+ }
+ src += stride;
+ }
+ break;
+ case GL_LUMINANCE:
+ src = (GLubyte *)image->Data + ( y * image->Width + x );
+ stride = (image->Width - width);
+ for ( i = height ; i ; i-- ) {
+ for ( j = width ; j ; j-- ) {
+
+ *destPtr++ = MGAPACKCOLOR8888(src[0],src[0],src[0], 255);
+ src += 1;
+ }
+ src += stride;
+ }
+ break;
+ case GL_INTENSITY:
+ src = (GLubyte *)image->Data + ( y * image->Width + x );
+ stride = (image->Width - width);
+ for ( i = height ; i ; i-- ) {
+ for ( j = width ; j ; j-- ) {
+
+ *destPtr++ = MGAPACKCOLOR8888(src[0],src[0],src[0],src[0]);
+ src += 1;
+ }
+ src += stride;
+ }
+ break;
+ case GL_ALPHA:
+ src = (GLubyte *)image->Data + ( y * image->Width + x );
+ stride = (image->Width - width);
+ for ( i = height ; i ; i-- ) {
+ for ( j = width ; j ; j-- ) {
+
+ *destPtr++ = MGAPACKCOLOR8888(255,255,255,src[0]);
+ src += 1;
+ }
+ src += stride;
+ }
+ break;
+ case GL_LUMINANCE_ALPHA:
+ src = (GLubyte *)image->Data + ( y * image->Width + x ) * 2;
+ stride = (image->Width - width) * 2;
+ for ( i = height ; i ; i-- ) {
+ for ( j = width ; j ; j-- ) {
+
+ *destPtr++ = MGAPACKCOLOR8888(src[0],src[0],
+ src[0],src[1]);
+ src += 2;
+ }
+ src += stride;
+ }
+ break;
+ default:
+ goto format_error;
+ }
+ break;
+ default:
+ goto format_error;
+ }
+
+ return;
+
+ format_error:
+
+ fprintf(stderr, "Unsupported texelBytes %i, image->Format %i\n",
+ (int)texelBytes, (int)image->Format );
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-08 06:52:50 +0000