Hi,
I have added support for 24bit displays to wmesa.c.
I have tested building it with VC9 and mingw compilers and running the
built dlls
for some simple rendering and readbacks with a 24bit display.
Basically I have copied the 32bit support and just updated the pointer
arithmetic,
although because there isn't a basic 3 byte type, I write each byte
separately as a BYTE.
I passed the cColorBits to the wmesa_set_renderbuffer_funcs as both
24bit and 32bit are using
the same pixelformat.
This is a patch against Mesa-7.1
Shane.
Only in Mesa-7.1-mingw-24bit: .cproject
--- Mesa-7.1/src/mesa/drivers/windows/gdi/wmesa.c 2008-08-26
02:46:44.000000000 +1200
+++ Mesa-7.1-mingw-24bit/src/mesa/drivers/windows/gdi/wmesa.c 2008-09-11
12:36:29.273735200 +1200
@@ -116,19 +116,21 @@
pwfb->cColorBits = GetDeviceCaps(hDC, BITSPIXEL);
/* Only 16 and 32 bit targets are supported now */
assert(pwfb->cColorBits == 0 ||
pwfb->cColorBits == 16 ||
+ pwfb->cColorBits == 24 ||
pwfb->cColorBits == 32);
switch(pwfb->cColorBits){
case 8:
pwfb->pixelformat = PF_INDEX8;
break;
case 16:
pwfb->pixelformat = PF_5R6G5B;
break;
+ case 24:
case 32:
pwfb->pixelformat = PF_8R8G8B;
break;
default:
pwfb->pixelformat = PF_BADFORMAT;
@@ -854,10 +856,199 @@
}
/*********************************************************************/
+/* DOUBLE BUFFER 24-bit */
+
+#define WMSETPIXEL24(pwc, y, x, r, g, b) { \
+LPBYTE lpb = ((LPBYTE)((pwc)->pbPixels + (pwc)->ScanWidth * (y)) + (3 * x)); \
+lpb[0] = (b); \
+lpb[1] = (g); \
+lpb[2] = (r); }
+
+/* Write a horizontal span of RGBA color pixels with a boolean mask. */
+static void write_rgba_span_24(const GLcontext *ctx,
+ struct gl_renderbuffer *rb,
+ GLuint n, GLint x, GLint y,
+ const GLubyte rgba[][4],
+ const GLubyte mask[] )
+{
+ WMesaContext pwc = wmesa_context(ctx);
+ WMesaFramebuffer pwfb = wmesa_framebuffer(ctx->DrawBuffer);
+ GLuint i;
+ LPBYTE lpb;
+
+ (void) ctx;
+
+ y=FLIP(y);
+ lpb = ((LPBYTE)(pwfb->pbPixels + pwfb->ScanWidth * y)) + (3 * x);
+ if (mask) {
+ for (i=0; i<n; i++)
+ if (mask[i]) {
+ lpb[3*i] = rgba[i][BCOMP];
+ lpb[3*i+1] = rgba[i][GCOMP];
+ lpb[3*i+2] = rgba[i][RCOMP];
+ }
+ }
+ else {
+ for (i=0; i<n; i++) {
+ *lpb++ = rgba[i][BCOMP];
+ *lpb++ = rgba[i][GCOMP];
+ *lpb++ = rgba[i][RCOMP];
+ }
+ }
+}
+
+
+/* Write a horizontal span of RGB color pixels with a boolean mask. */
+static void write_rgb_span_24(const GLcontext *ctx,
+ struct gl_renderbuffer *rb,
+ GLuint n, GLint x, GLint y,
+ const GLubyte rgb[][3],
+ const GLubyte mask[] )
+{
+ WMesaContext pwc = wmesa_context(ctx);
+ WMesaFramebuffer pwfb = wmesa_framebuffer(ctx->DrawBuffer);
+ GLuint i;
+ LPBYTE lpb;
+
+ (void) ctx;
+
+ y=FLIP(y);
+ lpb = ((LPBYTE)(pwfb->pbPixels + pwfb->ScanWidth * y)) + (3 * x);
+ if (mask) {
+ for (i=0; i<n; i++)
+ if (mask[i]) {
+ lpb[3*i] = rgb[i][BCOMP];
+ lpb[3*i+1] = rgb[i][GCOMP];
+ lpb[3*i+2] = rgb[i][RCOMP];
+ }
+ }
+ else {
+ for (i=0; i<n; i++) {
+ *lpb++ = rgb[i][BCOMP];
+ *lpb++ = rgb[i][GCOMP];
+ *lpb++ = rgb[i][RCOMP];
+ }
+ }
+}
+
+/*
+ * Write a horizontal span of pixels with a boolean mask. The current color
+ * is used for all pixels.
+ */
+static void write_mono_rgba_span_24(const GLcontext *ctx,
+ struct gl_renderbuffer *rb,
+ GLuint n, GLint x, GLint y,
+ const GLchan color[4],
+ const GLubyte mask[])
+{
+ LPBYTE lpb;
+ GLuint i;
+ WMesaContext pwc = wmesa_context(ctx);
+ WMesaFramebuffer pwfb = wmesa_framebuffer(ctx->DrawBuffer);
+ lpb = ((LPBYTE)(pwfb->pbPixels + pwfb->ScanWidth * y)) + (3 * x);
+ y=FLIP(y);
+ if (mask) {
+ for (i=0; i<n; i++)
+ if (mask[i]) {
+ lpb[3*i] = color[BCOMP];
+ lpb[3*i+1] = color[GCOMP];
+ lpb[3*i+2] = color[RCOMP];
+ }
+ }
+ else
+ for (i=0; i<n; i++) {
+ *lpb++ = color[BCOMP];
+ *lpb++ = color[GCOMP];
+ *lpb++ = color[RCOMP];
+ }
+}
+
+/* Write an array of RGBA pixels with a boolean mask. */
+static void write_rgba_pixels_24(const GLcontext *ctx,
+ struct gl_renderbuffer *rb,
+ GLuint n, const GLint x[], const GLint y[],
+ const GLubyte rgba[][4],
+ const GLubyte mask[])
+{
+ GLuint i;
+ WMesaContext pwc = wmesa_context(ctx);
+ WMesaFramebuffer pwfb = wmesa_framebuffer(ctx->DrawBuffer);
+ for (i=0; i<n; i++)
+ if (mask[i])
+ WMSETPIXEL24(pwfb, FLIP(y[i]), x[i],
+ rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
+}
+
+/*
+ * Write an array of pixels with a boolean mask. The current color
+ * is used for all pixels.
+ */
+static void write_mono_rgba_pixels_24(const GLcontext *ctx,
+ struct gl_renderbuffer *rb,
+ GLuint n,
+ const GLint x[], const GLint y[],
+ const GLchan color[4],
+ const GLubyte mask[])
+{
+ GLuint i;
+ WMesaContext pwc = wmesa_context(ctx);
+ WMesaFramebuffer pwfb = wmesa_framebuffer(ctx->DrawBuffer);
+ for (i=0; i<n; i++)
+ if (mask[i])
+ WMSETPIXEL24(pwfb, FLIP(y[i]),x[i],color[RCOMP],
+ color[GCOMP], color[BCOMP]);
+}
+
+/* Read a horizontal span of color pixels. */
+static void read_rgba_span_24(const GLcontext *ctx,
+ struct gl_renderbuffer *rb,
+ GLuint n, GLint x, GLint y,
+ GLubyte rgba[][4] )
+{
+ GLuint i;
+ LPBYTE lpb;
+ WMesaContext pwc = wmesa_context(ctx);
+ WMesaFramebuffer pwfb = wmesa_framebuffer(ctx->DrawBuffer);
+
+ y = FLIP(y);
+ lpb = ((LPBYTE)(pwfb->pbPixels + pwfb->ScanWidth * y)) + (3 * x);
+ for (i=0; i<n; i++) {
+ rgba[i][RCOMP] = lpb[3*i+2];
+ rgba[i][GCOMP] = lpb[3*i+1];
+ rgba[i][BCOMP] = lpb[3*i];
+ rgba[i][ACOMP] = 255;
+ }
+}
+
+
+/* Read an array of color pixels. */
+static void read_rgba_pixels_24(const GLcontext *ctx,
+ struct gl_renderbuffer *rb,
+ GLuint n, const GLint x[], const GLint y[],
+ GLubyte rgba[][4])
+{
+ GLuint i;
+ LPBYTE lpb;
+ WMesaContext pwc = wmesa_context(ctx);
+ WMesaFramebuffer pwfb = wmesa_framebuffer(ctx->DrawBuffer);
+
+ for (i=0; i<n; i++) {
+ GLint y2 = FLIP(y[i]);
+ lpb = ((LPBYTE)(pwfb->pbPixels + pwfb->ScanWidth * y2)) + (3 * x[i]);
+ rgba[i][RCOMP] = lpb[3*i+2];
+ rgba[i][GCOMP] = lpb[3*i+1];
+ rgba[i][BCOMP] = lpb[3*i];
+ rgba[i][ACOMP] = 255;
+ }
+}
+
+
+/*********************************************************************/
+
/* DOUBLE BUFFER 16-bit */
#define WMSETPIXEL16(pwc, y, x, r, g, b) { \
LPWORD lpw = ((LPWORD)((pwc)->pbPixels + (pwc)->ScanWidth * (y)) + (x)); \
*lpw = BGR16((r),(g),(b)); }
@@ -1075,11 +1266,11 @@
/**
* Plug in the Get/PutRow/Values functions for a renderbuffer depending
* on if we're drawing to the front or back color buffer.
*/
void wmesa_set_renderbuffer_funcs(struct gl_renderbuffer *rb, int pixelformat,
- int double_buffer)
+ BYTE cColorBits, int double_buffer)
{
if (double_buffer) {
/* back buffer */
/* Picking the correct span functions is important because
* the DIB was allocated with the indicated depth. */
@@ -1095,20 +1286,36 @@
rb->RedBits = 5;
rb->GreenBits = 6;
rb->BlueBits = 5;
break;
case PF_8R8G8B:
- rb->PutRow = write_rgba_span_32;
- rb->PutRowRGB = write_rgb_span_32;
- rb->PutMonoRow = write_mono_rgba_span_32;
- rb->PutValues = write_rgba_pixels_32;
- rb->PutMonoValues = write_mono_rgba_pixels_32;
- rb->GetRow = read_rgba_span_32;
- rb->GetValues = read_rgba_pixels_32;
+ if (cColorBits == 24)
+ {
+ rb->PutRow = write_rgba_span_24;
+ rb->PutRowRGB = write_rgb_span_24;
+ rb->PutMonoRow = write_mono_rgba_span_24;
+ rb->PutValues = write_rgba_pixels_24;
+ rb->PutMonoValues = write_mono_rgba_pixels_24;
+ rb->GetRow = read_rgba_span_24;
+ rb->GetValues = read_rgba_pixels_24;
+ rb->RedBits = 8;
+ rb->GreenBits = 8;
+ rb->BlueBits = 8;
+ }
+ else
+ {
+ rb->PutRow = write_rgba_span_32;
+ rb->PutRowRGB = write_rgb_span_32;
+ rb->PutMonoRow = write_mono_rgba_span_32;
+ rb->PutValues = write_rgba_pixels_32;
+ rb->PutMonoValues = write_mono_rgba_pixels_32;
+ rb->GetRow = read_rgba_span_32;
+ rb->GetValues = read_rgba_pixels_32;
rb->RedBits = 8;
rb->GreenBits = 8;
rb->BlueBits = 8;
+ }
break;
default:
break;
}
}
@@ -1411,15 +1618,15 @@
/* make render buffers */
if (visual->doubleBufferMode == 1) {
rb = wmesa_new_renderbuffer();
_mesa_add_renderbuffer(&pwfb->Base, BUFFER_BACK_LEFT, rb);
- wmesa_set_renderbuffer_funcs(rb, pwfb->pixelformat, 1);
+ wmesa_set_renderbuffer_funcs(rb, pwfb->pixelformat,
pwfb->cColorBits, 1);
}
rb = wmesa_new_renderbuffer();
_mesa_add_renderbuffer(&pwfb->Base, BUFFER_FRONT_LEFT, rb);
- wmesa_set_renderbuffer_funcs(rb, pwfb->pixelformat, 0);
+ wmesa_set_renderbuffer_funcs(rb, pwfb->pixelformat, pwfb->cColorBits,
0);
/* Let Mesa own the Depth, Stencil, and Accum buffers */
_mesa_add_soft_renderbuffers(&pwfb->Base,
GL_FALSE, /* color */
visual->depthBits > 0,
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