wmesa.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

    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)); }



/* Write a horizontal span of RGBA color pixels with a boolean mask. */
static void write_rgba_span_16(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;
    LPWORD lpw;

    (void) ctx;
    
    y=FLIP(y);
    lpw = ((LPWORD)(pwfb->pbPixels + pwfb->ScanWidth * y)) + x;
    if (mask) {
	for (i=0; i<n; i++)
	    if (mask[i])
                lpw[i] = BGR16(rgba[i][RCOMP], rgba[i][GCOMP], 
			       rgba[i][BCOMP]);
    }
    else {
	for (i=0; i<n; i++)
                *lpw++ = BGR16(rgba[i][RCOMP], rgba[i][GCOMP], 
			       rgba[i][BCOMP]);
    }
}


/* Write a horizontal span of RGB color pixels with a boolean mask. */
static void write_rgb_span_16(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;
    LPWORD lpw;

    (void) ctx;
    
    y=FLIP(y);
    lpw = ((LPWORD)(pwfb->pbPixels + pwfb->ScanWidth * y)) + x;
    if (mask) {
	for (i=0; i<n; i++)
	    if (mask[i])
                lpw[i] = BGR16(rgb[i][RCOMP], rgb[i][GCOMP], 
			       rgb[i][BCOMP]);
    }
    else {
	for (i=0; i<n; i++)
                *lpw++ = BGR16(rgb[i][RCOMP], rgb[i][GCOMP], 
			       rgb[i][BCOMP]);
    }
}

/*
 * Write a horizontal span of pixels with a boolean mask.  The current color
 * is used for all pixels.
 */
static void write_mono_rgba_span_16(const GLcontext *ctx, 
				    struct gl_renderbuffer *rb,
				    GLuint n, GLint x, GLint y,
				    const GLchan color[4], 
				    const GLubyte mask[])
{
    LPWORD lpw;
    WORD pixel;
    GLuint i;
    WMesaContext pwc = wmesa_context(ctx);
    WMesaFramebuffer pwfb = wmesa_framebuffer(ctx->DrawBuffer);
    (void) ctx;
    lpw = ((LPWORD)(pwfb->pbPixels + pwfb->ScanWidth * y)) + x;
    y=FLIP(y);
    pixel = BGR16(color[RCOMP], color[GCOMP], color[BCOMP]);
    if (mask) {
	for (i=0; i<n; i++)
	    if (mask[i])
                lpw[i] = pixel;
    }
    else
	for (i=0; i<n; i++)
                *lpw++ = pixel;

}

/* Write an array of RGBA pixels with a boolean mask. */
static void write_rgba_pixels_16(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);
    (void) ctx;
    for (i=0; i<n; i++)
	if (mask[i])
	    WMSETPIXEL16(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_16(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);
    (void) ctx;
    for (i=0; i<n; i++)
	if (mask[i])
	    WMSETPIXEL16(pwfb, FLIP(y[i]),x[i],color[RCOMP],
			 color[GCOMP], color[BCOMP]);
}

/* Read a horizontal span of color pixels. */
static void read_rgba_span_16(const GLcontext *ctx, 
			      struct gl_renderbuffer *rb,
			      GLuint n, GLint x, GLint y,
			      GLubyte rgba[][4] )
{
    GLuint i, pixel;
    LPWORD lpw;
    WMesaContext pwc = wmesa_context(ctx);
    WMesaFramebuffer pwfb = wmesa_framebuffer(ctx->DrawBuffer);
    
    y = FLIP(y);
    lpw = ((LPWORD)(pwfb->pbPixels + pwfb->ScanWidth * y)) + x;
    for (i=0; i<n; i++) {
	pixel = lpw[i];
	/* Windows uses 5,5,5 for 16-bit */
	rgba[i][RCOMP] = (pixel & 0x7c00) >> 7;
	rgba[i][GCOMP] = (pixel & 0x03e0) >> 2;
	rgba[i][BCOMP] = (pixel & 0x001f) << 3;
	rgba[i][ACOMP] = 255;
    }
}


/* Read an array of color pixels. */
static void read_rgba_pixels_16(const GLcontext *ctx, 
				struct gl_renderbuffer *rb,
				GLuint n, const GLint x[], const GLint y[],
				GLubyte rgba[][4])
{
    GLuint i, pixel;
    LPWORD lpw;
    WMesaContext pwc = wmesa_context(ctx);
    WMesaFramebuffer pwfb = wmesa_framebuffer(ctx->DrawBuffer);

    for (i=0; i<n; i++) {
	GLint y2 = FLIP(y[i]);
	lpw = ((LPWORD)(pwfb->pbPixels + pwfb->ScanWidth * y2)) + x[i];
	pixel = *lpw;
	/* Windows uses 5,5,5 for 16-bit */
	rgba[i][RCOMP] = (pixel & 0x7c00) >> 7;
	rgba[i][GCOMP] = (pixel & 0x03e0) >> 2;
	rgba[i][BCOMP] = (pixel & 0x001f) << 3;
	rgba[i][ACOMP] = 255;
  }
}




/**********************************************************************/
/*****                   BUFFER Functions                         *****/
/**********************************************************************/




static void
wmesa_delete_renderbuffer(struct gl_renderbuffer *rb)
{
    _mesa_free(rb);
}


/**
 * This is called by Mesa whenever it determines that the window size
 * has changed.  Do whatever's needed to cope with that.
 */
static GLboolean
wmesa_renderbuffer_storage(GLcontext *ctx, 
			   struct gl_renderbuffer *rb,
			   GLenum internalFormat, 
			   GLuint width, 
			   GLuint height)
{
    rb->Width = width;
    rb->Height = height;
    return GL_TRUE;
}


/**
 * 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,
                                  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. */
	switch(pixelformat) {
	case PF_5R6G5B:
	    rb->PutRow = write_rgba_span_16;
	    rb->PutRowRGB = write_rgb_span_16;
	    rb->PutMonoRow = write_mono_rgba_span_16;
	    rb->PutValues = write_rgba_pixels_16;
	    rb->PutMonoValues = write_mono_rgba_pixels_16;
	    rb->GetRow = read_rgba_span_16;
	    rb->GetValues = read_rgba_pixels_16;
            rb->RedBits = 5;
            rb->GreenBits = 6;
            rb->BlueBits = 5;
	    break;
	case PF_8R8G8B:
		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;