support for RGB_565 pixels (Lars Andersson), untested
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@ -1,4 +1,4 @@
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/* $Id: osmesa.h,v 1.6 2000/09/08 16:41:38 brianp Exp $ */
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/* $Id: osmesa.h,v 1.7 2001/06/27 13:56:17 brianp Exp $ */
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/*
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* Mesa 3-D graphics library
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@ -77,6 +77,7 @@ extern "C" {
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#define OSMESA_ARGB 0x2
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#define OSMESA_RGB GL_RGB
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#define OSMESA_BGR 0x4
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#define OSMESA_RGB_565 0x5
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/*
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@ -1,4 +1,4 @@
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/* $Id: osmesa.c,v 1.58 2001/06/15 13:41:12 brianp Exp $ */
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/* $Id: osmesa.c,v 1.59 2001/06/27 13:56:17 brianp Exp $ */
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/*
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* Mesa 3-D graphics library
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@ -251,6 +251,22 @@ OSMesaCreateContextExt( GLenum format, GLint depthBits, GLint stencilBits,
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rgbmode = GL_TRUE;
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swalpha = GL_TRUE;
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}
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else if (format==OSMESA_RGB_565) {
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indexBits = 0;
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redBits = 5;
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greenBits = 6;
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blueBits = 5;
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alphaBits = 0;
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rshift = 11;
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gshift = 5;
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bshift = 0;
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ashift = 0;
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rind = 0; /* not used */
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gind = 0;
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bind = 0;
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rgbmode = GL_TRUE;
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swalpha = GL_FALSE;
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}
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else {
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return NULL;
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}
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@ -377,6 +393,10 @@ static void compute_row_addresses( OSMesaContext ctx )
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/* RGB mode */
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bytesPerPixel = 3 * sizeof(GLchan);
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}
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else if (ctx->format == OSMESA_RGB_565) {
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/* 5/6/5 RGB pixel in 16 bits */
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bytesPerPixel = 2;
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}
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else {
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/* RGBA mode */
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bytesPerPixel = 4 * sizeof(GLchan);
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@ -421,7 +441,7 @@ static void compute_row_addresses( OSMesaContext ctx )
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* Input: ctx - the rendering context
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* buffer - the image buffer memory
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* type - data type for pixel components, only GL_UNSIGNED_BYTE
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* supported now
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* and GL_UNSIGNED_SHORT_5_6_5 supported now.
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* width, height - size of image buffer in pixels, at least 1
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* Return: GL_TRUE if success, GL_FALSE if error because of invalid ctx,
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* invalid buffer address, type!=GL_UNSIGNED_BYTE, width<1, height<1,
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@ -431,12 +451,19 @@ GLboolean GLAPIENTRY
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OSMesaMakeCurrent( OSMesaContext ctx, void *buffer, GLenum type,
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GLsizei width, GLsizei height )
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{
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if (!ctx || !buffer || type != CHAN_TYPE ||
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if (!ctx || !buffer ||
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width < 1 || height < 1 ||
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width > MAX_WIDTH || height > MAX_HEIGHT) {
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return GL_FALSE;
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}
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if (ctx->format == OSMESA_RGB_565 && type != GL_UNSIGNED_SHORT_5_6_5) {
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return GL_FALSE;
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}
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else if (type != CHAN_TYPE) {
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return GL_FALSE;
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}
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osmesa_update_state( &ctx->gl_ctx, 0 );
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_mesa_make_current( &ctx->gl_ctx, ctx->gl_buffer );
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@ -619,6 +646,11 @@ do { \
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(DST)[2] = R; \
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} while (0)
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#define PACK_RGB_565(DST, R, G, B) \
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do { \
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(DST) = (((R) << 8) & 0xf800) | (((G) << 3) & 0x7e0) | ((B) >> 3);\
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} while (0)
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#define UNPACK_RED(P) ( (P)[osmesa->rInd] )
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#define UNPACK_GREEN(P) ( (P)[osmesa->gInd] )
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@ -627,6 +659,7 @@ do { \
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#define PIXELADDR1(X,Y) (osmesa->rowaddr[Y] + (X))
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#define PIXELADDR2(X,Y) (osmesa->rowaddr[Y] + 2 * (X))
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#define PIXELADDR3(X,Y) (osmesa->rowaddr[Y] + 3 * (X))
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#define PIXELADDR4(X,Y) (osmesa->rowaddr[Y] + 4 * (X))
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@ -741,6 +774,34 @@ static void clear( GLcontext *ctx, GLbitfield mask, GLboolean all,
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}
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}
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}
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else if (osmesa->format == OSMESA_RGB_565) {
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const GLchan r = ctx->Color.ClearColor[0];
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const GLchan g = ctx->Color.ClearColor[1];
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const GLchan b = ctx->Color.ClearColor[2];
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GLushort clearPixel;
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PACK_RGB_565(clearPixel, r, g, b);
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if (all) {
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/* Clear whole RGB buffer */
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const GLint n = osmesa->rowlength * osmesa->height;
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GLushort *ptr2 = (GLushort *) osmesa->buffer;
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GLuint i;
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for (i = 0; i < n; i++) {
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*ptr2 = clearPixel;
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ptr2++;
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}
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}
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else {
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/* clear scissored region */
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GLint i, j;
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for (i = 0; i < height; i++) {
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GLushort *ptr2 = (GLushort *) PIXELADDR2(x, (y + i));
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for (j = 0; j < width; j++) {
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*ptr2 = clearPixel;
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ptr2++;
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}
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}
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}
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}
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else {
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#if CHAN_TYPE == GL_UNSIGNED_BYTE
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/* 4-byte pixel value */
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@ -1207,6 +1268,145 @@ read_rgba_pixels3( const GLcontext *ctx,
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}
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/**********************************************************************/
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/***** 2 byte RGB pixel support funcs *****/
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/**********************************************************************/
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/* Write RGBA pixels to an RGB_565 buffer. */
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static void
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write_rgba_span2( const GLcontext *ctx,
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GLuint n, GLint x, GLint y,
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CONST GLubyte rgba[][4], const GLubyte mask[] )
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{
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OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
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GLushort *ptr2 = (GLushort *) PIXELADDR2(x, y);
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GLuint i;
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if (mask) {
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for (i = 0; i < n; i++, ptr2++) {
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if (mask[i]) {
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PACK_RGB_565(*ptr2, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
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}
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}
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}
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else {
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for (i = 0; i < n; i++, ptr2++) {
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PACK_RGB_565(*ptr2, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
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}
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}
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}
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/* Write RGB pixels to an RGB_565 buffer. */
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static void
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write_rgb_span2( const GLcontext *ctx,
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GLuint n, GLint x, GLint y,
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CONST GLubyte rgb[][3], const GLubyte mask[] )
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{
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OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
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GLushort *ptr2 = (GLushort *) PIXELADDR2(x, y);
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GLuint i;
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if (mask) {
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for (i = 0; i < n; i++, ptr2++) {
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if (mask[i]) {
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PACK_RGB_565(*ptr2, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]);
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}
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}
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}
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else {
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for (i = 0; i < n; i++, ptr2++) {
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PACK_RGB_565(*ptr2, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]);
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}
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}
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}
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static void
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write_monocolor_span2( const GLcontext *ctx, GLuint n, GLint x, GLint y,
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const GLchan color[4], const GLubyte mask[] )
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{
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OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
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GLushort pixel;
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GLushort *ptr2 = (GLushort *) PIXELADDR2(x, y);
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GLuint i;
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PACK_RGB_565(pixel, color[RCOMP], color[GCOMP], color[BCOMP]);
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for (i = 0; i < n; i++, ptr2++) {
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if (mask[i]) {
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*ptr2 = pixel;
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}
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}
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}
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static void
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write_rgba_pixels2( const GLcontext *ctx,
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GLuint n, const GLint x[], const GLint y[],
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CONST GLubyte rgba[][4], const GLubyte mask[] )
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{
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OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
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GLuint i;
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for (i = 0; i < n; i++) {
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if (mask[i]) {
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GLushort *ptr2 = (GLushort *) PIXELADDR2(x[i],y[i]);
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PACK_RGB_565(*ptr2, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
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}
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}
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}
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static void
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write_monocolor_pixels2( const GLcontext *ctx,
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GLuint n, const GLint x[], const GLint y[],
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const GLchan color[4], const GLubyte mask[] )
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{
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OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
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GLuint i;
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GLushort pixel;
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PACK_RGB_565(pixel, color[RCOMP], color[GCOMP], color[BCOMP]);
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for (i = 0; i < n; i++) {
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if (mask[i]) {
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GLushort *ptr2 = (GLushort *) PIXELADDR2(x[i],y[i]);
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*ptr2 = pixel;
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}
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}
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}
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static void
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read_rgba_span2( const GLcontext *ctx,
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GLuint n, GLint x, GLint y,
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GLubyte rgba[][4] )
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{
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OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
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GLuint i;
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const GLushort *ptr2 = (const GLushort *) PIXELADDR2(x, y);
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for (i = 0; i < n; i++, ptr2++) {
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/* This should be fixed to get the low bits right */
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rgba[i][RCOMP] = (*ptr2 >> 8) & 0xFe;
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rgba[i][GCOMP] = (*ptr2 >> 3) & 0xFc;
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rgba[i][BCOMP] = (*ptr2 << 3) & 0xFe;
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rgba[i][ACOMP] = 0;
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}
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}
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static void
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read_rgba_pixels2( const GLcontext *ctx,
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GLuint n, const GLint x[], const GLint y[],
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GLubyte rgba[][4], const GLubyte mask[] )
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{
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OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
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GLuint i;
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for (i = 0; i < n; i++) {
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if (mask[i]) {
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/* This should be fixed to get the low bits right */
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const GLushort *ptr2 = (const GLushort *) PIXELADDR2(x[i],y[i]);
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rgba[i][RCOMP] = (*ptr2 >> 8) & 0xFE;
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rgba[i][GCOMP] = (*ptr2 >> 3) & 0xFC;
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rgba[i][BCOMP] = (*ptr2 << 3) & 0xFE;
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rgba[i][ACOMP] = 0;
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}
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}
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}
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/**********************************************************************/
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/***** Read/write spans/arrays of CI pixels *****/
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/**********************************************************************/
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@ -1830,6 +2030,15 @@ static void osmesa_update_state( GLcontext *ctx, GLuint new_state )
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swdd->ReadRGBASpan = read_rgba_span3;
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swdd->ReadRGBAPixels = read_rgba_pixels3;
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}
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else if (osmesa->format == OSMESA_RGB_565) {
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swdd->WriteRGBASpan = write_rgba_span2;
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swdd->WriteRGBSpan = write_rgb_span2;
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swdd->WriteMonoRGBASpan = write_monocolor_span2;
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swdd->WriteRGBAPixels = write_rgba_pixels2;
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swdd->WriteMonoRGBAPixels = write_monocolor_pixels2;
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swdd->ReadRGBASpan = read_rgba_span2;
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swdd->ReadRGBAPixels = read_rgba_pixels2;
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}
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else {
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/* 4 GLchan / pixel in frame buffer */
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swdd->WriteRGBSpan = write_rgb_span;
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