2 * Mesa 3-D graphics library
4 * Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
27 #include "condrender.h"
29 #include "format_unpack.h"
30 #include "format_pack.h"
35 #include "main/dispatch.h"
39 _mesa_ClearAccum( GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha )
42 GET_CURRENT_CONTEXT(ctx);
44 tmp[0] = CLAMP( red, -1.0F, 1.0F );
45 tmp[1] = CLAMP( green, -1.0F, 1.0F );
46 tmp[2] = CLAMP( blue, -1.0F, 1.0F );
47 tmp[3] = CLAMP( alpha, -1.0F, 1.0F );
49 if (TEST_EQ_4V(tmp, ctx->Accum.ClearColor))
52 COPY_4FV( ctx->Accum.ClearColor, tmp );
57 _mesa_Accum( GLenum op, GLfloat value )
59 GET_CURRENT_CONTEXT(ctx);
60 FLUSH_VERTICES(ctx, 0);
71 _mesa_error(ctx, GL_INVALID_ENUM, "glAccum(op)");
75 if (ctx->DrawBuffer->Visual.haveAccumBuffer == 0) {
76 _mesa_error(ctx, GL_INVALID_OPERATION, "glAccum(no accum buffer)");
80 if (ctx->DrawBuffer != ctx->ReadBuffer) {
81 /* See GLX_SGI_make_current_read or WGL_ARB_make_current_read,
82 * or GL_EXT_framebuffer_blit.
84 _mesa_error(ctx, GL_INVALID_OPERATION,
85 "glAccum(different read/draw buffers)");
90 _mesa_update_state(ctx);
92 if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
93 _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
94 "glAccum(incomplete framebuffer)");
98 if (ctx->RasterDiscard)
101 if (ctx->RenderMode == GL_RENDER) {
102 _mesa_accum(ctx, op, value);
108 * Clear the accumulation buffer by mapping the renderbuffer and
109 * writing the clear color to it. Called by the driver's implementation
110 * of the glClear function.
113 _mesa_clear_accum_buffer(struct gl_context *ctx)
115 GLuint x, y, width, height;
118 struct gl_renderbuffer *accRb;
120 if (!ctx->DrawBuffer)
123 accRb = ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer;
125 return; /* missing accum buffer, not an error */
127 /* bounds, with scissor */
128 x = ctx->DrawBuffer->_Xmin;
129 y = ctx->DrawBuffer->_Ymin;
130 width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
131 height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
133 ctx->Driver.MapRenderbuffer(ctx, accRb, x, y, width, height,
134 GL_MAP_WRITE_BIT, &accMap, &accRowStride);
137 _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
141 if (accRb->Format == MESA_FORMAT_SIGNED_RGBA_16) {
142 const GLshort clearR = FLOAT_TO_SHORT(ctx->Accum.ClearColor[0]);
143 const GLshort clearG = FLOAT_TO_SHORT(ctx->Accum.ClearColor[1]);
144 const GLshort clearB = FLOAT_TO_SHORT(ctx->Accum.ClearColor[2]);
145 const GLshort clearA = FLOAT_TO_SHORT(ctx->Accum.ClearColor[3]);
148 for (j = 0; j < height; j++) {
149 GLshort *row = (GLshort *) accMap;
151 for (i = 0; i < width; i++) {
152 row[i * 4 + 0] = clearR;
153 row[i * 4 + 1] = clearG;
154 row[i * 4 + 2] = clearB;
155 row[i * 4 + 3] = clearA;
157 accMap += accRowStride;
161 /* other types someday? */
162 _mesa_warning(ctx, "unexpected accum buffer type");
165 ctx->Driver.UnmapRenderbuffer(ctx, accRb);
176 accum_scale_or_bias(struct gl_context *ctx, GLfloat value,
177 GLint xpos, GLint ypos, GLint width, GLint height,
180 struct gl_renderbuffer *accRb =
181 ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer;
187 ctx->Driver.MapRenderbuffer(ctx, accRb, xpos, ypos, width, height,
188 GL_MAP_READ_BIT | GL_MAP_WRITE_BIT,
189 &accMap, &accRowStride);
192 _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
196 if (accRb->Format == MESA_FORMAT_SIGNED_RGBA_16) {
197 const GLshort incr = (GLshort) (value * 32767.0f);
200 for (j = 0; j < height; j++) {
201 GLshort *acc = (GLshort *) accMap;
202 for (i = 0; i < 4 * width; i++) {
205 accMap += accRowStride;
210 for (j = 0; j < height; j++) {
211 GLshort *acc = (GLshort *) accMap;
212 for (i = 0; i < 4 * width; i++) {
213 acc[i] = (GLshort) (acc[i] * value);
215 accMap += accRowStride;
220 /* other types someday? */
223 ctx->Driver.UnmapRenderbuffer(ctx, accRb);
229 * Accum = ColorBuf * value
231 * Accum += ColorBuf * value
234 accum_or_load(struct gl_context *ctx, GLfloat value,
235 GLint xpos, GLint ypos, GLint width, GLint height,
238 struct gl_renderbuffer *accRb =
239 ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer;
240 struct gl_renderbuffer *colorRb = ctx->ReadBuffer->_ColorReadBuffer;
241 GLubyte *accMap, *colorMap;
242 GLint accRowStride, colorRowStride;
243 GLbitfield mappingFlags;
246 /* no read buffer - OK */
252 mappingFlags = GL_MAP_WRITE_BIT;
253 if (!load) /* if we're accumulating */
254 mappingFlags |= GL_MAP_READ_BIT;
256 /* Map accum buffer */
257 ctx->Driver.MapRenderbuffer(ctx, accRb, xpos, ypos, width, height,
258 mappingFlags, &accMap, &accRowStride);
260 _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
264 /* Map color buffer */
265 ctx->Driver.MapRenderbuffer(ctx, colorRb, xpos, ypos, width, height,
267 &colorMap, &colorRowStride);
269 ctx->Driver.UnmapRenderbuffer(ctx, accRb);
270 _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
274 if (accRb->Format == MESA_FORMAT_SIGNED_RGBA_16) {
275 const GLfloat scale = value * 32767.0f;
279 rgba = malloc(width * 4 * sizeof(GLfloat));
281 for (j = 0; j < height; j++) {
282 GLshort *acc = (GLshort *) accMap;
284 /* read colors from source color buffer */
285 _mesa_unpack_rgba_row(colorRb->Format, width, colorMap, rgba);
288 for (i = 0; i < width; i++) {
289 acc[i * 4 + 0] = (GLshort) (rgba[i][RCOMP] * scale);
290 acc[i * 4 + 1] = (GLshort) (rgba[i][GCOMP] * scale);
291 acc[i * 4 + 2] = (GLshort) (rgba[i][BCOMP] * scale);
292 acc[i * 4 + 3] = (GLshort) (rgba[i][ACOMP] * scale);
297 for (i = 0; i < width; i++) {
298 acc[i * 4 + 0] += (GLshort) (rgba[i][RCOMP] * scale);
299 acc[i * 4 + 1] += (GLshort) (rgba[i][GCOMP] * scale);
300 acc[i * 4 + 2] += (GLshort) (rgba[i][BCOMP] * scale);
301 acc[i * 4 + 3] += (GLshort) (rgba[i][ACOMP] * scale);
305 colorMap += colorRowStride;
306 accMap += accRowStride;
312 _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
316 /* other types someday? */
319 ctx->Driver.UnmapRenderbuffer(ctx, accRb);
320 ctx->Driver.UnmapRenderbuffer(ctx, colorRb);
325 * ColorBuffer = Accum * value
328 accum_return(struct gl_context *ctx, GLfloat value,
329 GLint xpos, GLint ypos, GLint width, GLint height)
331 struct gl_framebuffer *fb = ctx->DrawBuffer;
332 struct gl_renderbuffer *accRb = fb->Attachment[BUFFER_ACCUM].Renderbuffer;
333 GLubyte *accMap, *colorMap;
334 GLint accRowStride, colorRowStride;
337 /* Map accum buffer */
338 ctx->Driver.MapRenderbuffer(ctx, accRb, xpos, ypos, width, height,
340 &accMap, &accRowStride);
342 _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
346 /* Loop over destination buffers */
347 for (buffer = 0; buffer < fb->_NumColorDrawBuffers; buffer++) {
348 struct gl_renderbuffer *colorRb = fb->_ColorDrawBuffers[buffer];
349 const GLboolean masking = (!ctx->Color.ColorMask[buffer][RCOMP] ||
350 !ctx->Color.ColorMask[buffer][GCOMP] ||
351 !ctx->Color.ColorMask[buffer][BCOMP] ||
352 !ctx->Color.ColorMask[buffer][ACOMP]);
353 GLbitfield mappingFlags = GL_MAP_WRITE_BIT;
356 mappingFlags |= GL_MAP_READ_BIT;
358 /* Map color buffer */
359 ctx->Driver.MapRenderbuffer(ctx, colorRb, xpos, ypos, width, height,
360 mappingFlags, &colorMap, &colorRowStride);
362 _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
366 if (accRb->Format == MESA_FORMAT_SIGNED_RGBA_16) {
367 const GLfloat scale = value / 32767.0f;
369 GLfloat (*rgba)[4], (*dest)[4];
371 rgba = malloc(width * 4 * sizeof(GLfloat));
372 dest = malloc(width * 4 * sizeof(GLfloat));
375 for (j = 0; j < height; j++) {
376 GLshort *acc = (GLshort *) accMap;
378 for (i = 0; i < width; i++) {
379 rgba[i][0] = acc[i * 4 + 0] * scale;
380 rgba[i][1] = acc[i * 4 + 1] * scale;
381 rgba[i][2] = acc[i * 4 + 2] * scale;
382 rgba[i][3] = acc[i * 4 + 3] * scale;
387 /* get existing colors from dest buffer */
388 _mesa_unpack_rgba_row(colorRb->Format, width, colorMap, dest);
390 /* use the dest colors where mask[channel] = 0 */
391 if (ctx->Color.ColorMask[buffer][RCOMP] == 0) {
392 for (i = 0; i < width; i++)
393 rgba[i][RCOMP] = dest[i][RCOMP];
395 if (ctx->Color.ColorMask[buffer][GCOMP] == 0) {
396 for (i = 0; i < width; i++)
397 rgba[i][GCOMP] = dest[i][GCOMP];
399 if (ctx->Color.ColorMask[buffer][BCOMP] == 0) {
400 for (i = 0; i < width; i++)
401 rgba[i][BCOMP] = dest[i][BCOMP];
403 if (ctx->Color.ColorMask[buffer][ACOMP] == 0) {
404 for (i = 0; i < width; i++)
405 rgba[i][ACOMP] = dest[i][ACOMP];
409 _mesa_pack_float_rgba_row(colorRb->Format, width,
410 (const GLfloat (*)[4]) rgba, colorMap);
412 accMap += accRowStride;
413 colorMap += colorRowStride;
417 _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
423 /* other types someday? */
426 ctx->Driver.UnmapRenderbuffer(ctx, colorRb);
429 ctx->Driver.UnmapRenderbuffer(ctx, accRb);
435 * Software fallback for glAccum. A hardware driver that supports
436 * signed 16-bit color channels could implement hardware accumulation
437 * operations, but no driver does so at this time.
440 _mesa_accum(struct gl_context *ctx, GLenum op, GLfloat value)
442 GLint xpos, ypos, width, height;
444 if (!ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer) {
445 _mesa_warning(ctx, "Calling glAccum() without an accumulation buffer");
449 if (!_mesa_check_conditional_render(ctx))
452 xpos = ctx->DrawBuffer->_Xmin;
453 ypos = ctx->DrawBuffer->_Ymin;
454 width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
455 height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
460 accum_scale_or_bias(ctx, value, xpos, ypos, width, height, GL_TRUE);
465 accum_scale_or_bias(ctx, value, xpos, ypos, width, height, GL_FALSE);
470 accum_or_load(ctx, value, xpos, ypos, width, height, GL_FALSE);
474 accum_or_load(ctx, value, xpos, ypos, width, height, GL_TRUE);
477 accum_return(ctx, value, xpos, ypos, width, height);
480 _mesa_problem(ctx, "invalid mode in _mesa_accum()");
487 _mesa_init_accum( struct gl_context *ctx )
489 /* Accumulate buffer group */
490 ASSIGN_4V( ctx->Accum.ClearColor, 0.0, 0.0, 0.0, 0.0 );