PIGLIT_GL_TEST_CONFIG_END
enum piglit_result
piglit_display(void)
{
bool pass = true;
float green[4] = {0.0, 1.0, 0.0, 0.0};
/* Clear red. */
glClearColor(1.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
/* Draw top half of screen green. */
glColor4f(0.0, 1.0, 0.0, 0.0);
piglit_draw_rect(-1, 0, 2, 1);
/* Discard a copy over the bottom red over the top green. */
glEnable(GL_RASTERIZER_DISCARD);
glRasterPos2i(-1, 0);
glCopyPixels(0, 0, piglit_width, piglit_height / 2, GL_COLOR);
/* Don't discard a copy of the green over the remaining red. */
glDisable(GL_RASTERIZER_DISCARD);
glRasterPos2i(-1, -1);
glCopyPixels(0, piglit_height / 2, piglit_width, piglit_height / 2,
GL_COLOR);
pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, green);
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
enum piglit_result
piglit_display(void)
{
GLfloat firstPixel[4];
bool pass = true;
/* read from fbo, draw to window */
glBindFramebuffer(GL_READ_FRAMEBUFFER, fbo);
glReadBuffer(GL_COLOR_ATTACHMENT0);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
glDrawBuffer(GL_BACK);
/* init color buffer to red */
glClearColor(1, 0, 0, 1);
glClear(GL_COLOR_BUFFER_BIT);
/* copy (undefined) fbo image to window */
glWindowPos2i(0, 0);
glCopyPixels(0, 0, piglit_width, piglit_height, GL_COLOR);
glBindFramebuffer(GL_READ_FRAMEBUFFER, piglit_winsys_fbo);
glReadBuffer(GL_BACK);
glReadPixels(0, 0, 1, 1, GL_RGBA, GL_FLOAT, firstPixel);
pass = piglit_probe_rect_rgb(0, 0, piglit_width, piglit_height,
firstPixel);
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_WARN;
}
static enum piglit_result test_copy(void)
{
/* Clear stencil to 0xfe. */
glClearStencil(0xfefe);
glClear(GL_STENCIL_BUFFER_BIT);
/* Initialize stencil. */
glEnable(GL_STENCIL_TEST);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
/* Set the upper-right corner to 0x3333 and copy the content to the lower-left one. */
glStencilFunc(GL_ALWAYS, 0x3333 & mask, ~0);
piglit_draw_rect(0, 0, 1, 1);
if (test == BLIT)
glBlitFramebufferEXT(BUF_SIZE/2+1, BUF_SIZE/2+1, BUF_SIZE, BUF_SIZE,
0, 0, BUF_SIZE/2, BUF_SIZE/2,
GL_STENCIL_BUFFER_BIT, GL_NEAREST);
else
glCopyPixels(BUF_SIZE/2+1, BUF_SIZE/2+1, BUF_SIZE/2, BUF_SIZE/2, GL_STENCIL);
/* Initialize the other corners. */
glStencilFunc(GL_ALWAYS, 0x6666 & mask, ~0);
piglit_draw_rect(0, -1, 1, 1);
glStencilFunc(GL_ALWAYS, 0x9999 & mask, ~0);
piglit_draw_rect(-1, 0, 1, 1);
glStencilFunc(GL_ALWAYS, 0xbbbb & mask, ~0);
piglit_draw_rect(0, 0, 1, 1);
glDisable(GL_STENCIL_TEST);
return compare_stencil();
}
static void
draw_stencil_mipmap(int x, int y, int dim, GLuint tex, GLuint level)
{
GLuint fbo;
GLint draw_buffer, read_buffer;
glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
glGetIntegerv(GL_READ_BUFFER, &read_buffer);
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_READ_FRAMEBUFFER, fbo);
glDrawBuffer(GL_NONE);
glReadBuffer(GL_NONE);
glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
GL_TEXTURE_2D, tex, level);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
glWindowPos2i(x, y);
glCopyPixels(0, 0, dim, dim, GL_STENCIL);
if (!piglit_check_gl_error(GL_NO_ERROR)) {
/* The blit shouldn't generate an error. If it does, report failure */
piglit_report_result(PIGLIT_FAIL);
}
glBindFramebuffer(GL_FRAMEBUFFER, piglit_winsys_fbo);
glDeleteFramebuffers(1, &fbo);
glDrawBuffer(draw_buffer);
glReadBuffer(read_buffer);
}
static void cdscrollarea (cdCtxCanvas *ctxcanvas, int xmin, int xmax, int ymin, int ymax, int dx, int dy)
{
glRasterPos2i(xmin+dx, ymin+dy);
glCopyPixels(xmin, ymin, xmax-xmin+1, ymax-ymin+1, GL_RGBA);
(void)ctxcanvas;
}
static enum piglit_result test_copy(void)
{
/* Clear. */
glClearDepth(0);
glClear(GL_DEPTH_BUFFER_BIT);
/* Initialize buffers. */
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_ALWAYS);
/* Set the upper-right corner to 0x3333 and copy the content to the lower-left one. */
piglit_draw_rect_z(-0.5, 0, 0, 1, 1);
if (test == BLIT)
glBlitFramebufferEXT(BUF_SIZE/2+1, BUF_SIZE/2+1, BUF_SIZE, BUF_SIZE,
0, 0, BUF_SIZE/2, BUF_SIZE/2,
GL_DEPTH_BUFFER_BIT, GL_NEAREST);
else
glCopyPixels(BUF_SIZE/2+1, BUF_SIZE/2+1, BUF_SIZE/2, BUF_SIZE/2, GL_DEPTH);
/* Initialize the other corners. */
piglit_draw_rect_z(-0.25, 0, -1, 1, 1);
piglit_draw_rect_z(0.25, -1, 0, 1, 1);
piglit_draw_rect_z(0.5, 0, 0, 1, 1);
glDisable(GL_DEPTH_TEST);
return compare();
}
enum piglit_result
piglit_display(void)
{
bool pass = true;
float green[4] = {0.0, 1.0, 0.0, 0.0};
GLuint qpass, qfail;
glClearColor(1.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
glGenQueries(1, &qpass);
glGenQueries(1, &qfail);
/* Generate query pass: draw top half of screen. */
glColor4f(0.0, 1.0, 0.0, 0.0);
glBeginQuery(GL_SAMPLES_PASSED, qpass);
piglit_draw_rect(-1, 0, 2, 1);
glEndQuery(GL_SAMPLES_PASSED);
/* Generate query fail */
glBeginQuery(GL_SAMPLES_PASSED, qfail);
glEndQuery(GL_SAMPLES_PASSED);
/* Conditional render that should not copy red over the green. */
glBeginConditionalRenderNV(qfail, GL_QUERY_WAIT_NV);
glRasterPos2i(-1, 0);
glCopyPixels(0, 0, piglit_width, piglit_height / 2, GL_COLOR);
glEndConditionalRenderNV();
/* Conditional render that should copy green over remaining red. */
glBeginConditionalRenderNV(qpass, GL_QUERY_WAIT_NV);
glRasterPos2i(-1, -1);
glCopyPixels(0, piglit_height / 2, piglit_width, piglit_height / 2,
GL_COLOR);
glEndConditionalRenderNV();
pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height,
green);
glutSwapBuffers();
glDeleteQueries(1, &qfail);
glDeleteQueries(1, &qpass);
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
enum piglit_result
piglit_display(void)
{
GLboolean pass = GL_TRUE;
int dst_x = piglit_width / 2 + 10, dst_y;
int dst_w = 10, dst_h = 10;
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
/* whole window red */
glClearColor(1.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
/* right half green */
glColor4f(0.0, 1.0, 0.0, 0.0);
piglit_draw_rect(piglit_width / 2, 0, piglit_width / 2, piglit_height);
/* Copy a 10x10 square from left to right */
glEnable(GL_SCISSOR_TEST);
dst_y = 10;
glScissor(dst_x, dst_y, dst_w, dst_h);
glRasterPos2i(dst_x - 5, dst_y - 5);
glCopyPixels(10, 10, 20, 20, GL_COLOR);
/* Don't copy a 10x10 square from left to right */
dst_y = 30;
glScissor(dst_x, dst_y, 0, 0);
glRasterPos2i(dst_x - 5, dst_y - 5);
glCopyPixels(10, 10, 20, 20, GL_COLOR);
/* Copy an unscissored 10x10 square from left to right */
glDisable(GL_SCISSOR_TEST);
dst_y = 50;
glRasterPos2i(dst_x, dst_y);
glCopyPixels(10, 10, dst_w, dst_h, GL_COLOR);
pass &= check_red_box_surrounded_by_green(dst_x, 10, dst_w, dst_h);
pass &= check_red_box_surrounded_by_green(dst_x, 30, 0, 0);
pass &= check_red_box_surrounded_by_green(dst_x, 50, dst_w, dst_h);
glutSwapBuffers();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
void motion(int x, int y) {
static GLint screeny;
screeny = height - (GLint)y;
glRasterPos2i(x, screeny);
glPixelZoom(zoomFactor, zoomFactor);
glCopyPixels(0, 0, checkImageWidth, checkImageHeight, GL_COLOR);
glPixelZoom(1.0, 1.0);
glFlush();
}
void __glXDisp_CopyPixels(GLbyte *pc)
{
glCopyPixels(
*(GLint *)(pc + 0),
*(GLint *)(pc + 4),
*(GLsizei *)(pc + 8),
*(GLsizei *)(pc + 12),
*(GLenum *)(pc + 16)
);
}
static void Display( void )
{
const int dx = (WinWidth - ImgWidth) / 2;
const int dy = (WinHeight - ImgHeight) / 2;
if (DrawFront) {
glDrawBuffer(GL_FRONT);
glReadBuffer(GL_FRONT);
}
else {
glDrawBuffer(GL_BACK);
glReadBuffer(GL_BACK);
}
glClear( GL_COLOR_BUFFER_BIT );
/* draw original image */
glWindowPos2iARB(dx, dy);
glDrawPixels(ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, Image);
if (Scissor)
glEnable(GL_SCISSOR_TEST);
if (Invert) {
glPixelTransferf(GL_RED_SCALE, -1.0);
glPixelTransferf(GL_GREEN_SCALE, -1.0);
glPixelTransferf(GL_BLUE_SCALE, -1.0);
glPixelTransferf(GL_RED_BIAS, 1.0);
glPixelTransferf(GL_GREEN_BIAS, 1.0);
glPixelTransferf(GL_BLUE_BIAS, 1.0);
}
/* draw copy */
glPixelZoom(Xzoom, Yzoom);
glWindowPos2iARB(Xpos, Ypos);
glCopyPixels(dx, dy, ImgWidth, ImgHeight, GL_COLOR);
glPixelZoom(1, 1);
glDisable(GL_SCISSOR_TEST);
if (Invert) {
glPixelTransferf(GL_RED_SCALE, 1.0);
glPixelTransferf(GL_GREEN_SCALE, 1.0);
glPixelTransferf(GL_BLUE_SCALE, 1.0);
glPixelTransferf(GL_RED_BIAS, 0.0);
glPixelTransferf(GL_GREEN_BIAS, 0.0);
glPixelTransferf(GL_BLUE_BIAS, 0.0);
}
if (DrawFront)
glFinish();
else
glutSwapBuffers();
}
static void
copy(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1)
{
GLsizei srcW = srcX1 - srcX0, srcH = srcY1 - srcY0;
GLsizei dstW = dstX1 - dstX0, dstH = dstY1 - dstY0;
glPixelZoom((float) dstW / (float) srcW,
(float) dstH / (float) srcH);
glWindowPos2i(dstX0, dstY0);
glCopyPixels(srcX0, srcY0, srcW, srcH, GL_COLOR);
}
void tui::LayoutCanvas::viewshift()
{
//@TODO screen sliding. Some rough ideas.
int Wcl, Hcl;
const int slide_step = 100;
GetClientSize(&Wcl,&Hcl);
glReadBuffer(GL_FRONT);
glRasterPos2i (0, 0);
glCopyPixels (slide_step, 0, Wcl-slide_step, Hcl, GL_COLOR);
glAccum(GL_LOAD, 1.0);
/* slide = false;*/
}
void
motion (int x, int y)
{
static GLint screeny;
screeny = height - (GLint) y;
glRasterPos2i (x, screeny);
glPixelZoom (zoomFactor, zoomFactor);
glCopyPixels (0, 0, TEST_IMAGE_WIDTH, TEST_IMAGE_HEIGHT, GL_COLOR);
glPixelZoom (1.0, 1.0);
glFlush ();
}
void bmp_copy(void){
glClear(GL_COLOR_BUFFER_BIT);
glBegin(GL_TRIANGLES);
glColor3f(1.0f,0.0f,0.0f); glVertex2f(0.0f,0.0f);
glColor3f(0.0f,1.0f,0.0f); glVertex2f(1.0f,0.0f);
glColor3f(0.0f,0.0f,1.0f); glVertex2f(0.5f,1.0f);
glEnd();
glPixelZoom(-0.5f, -0.5f);
glRasterPos2i(1,1);
glCopyPixels(WIDTH/2, HEIGHT/2, WIDTH/2, HEIGHT/2, GL_COLOR);
glutSwapBuffers();
}
void
HaloRefImage::draw_output()
{
if (use_fbos)
glBindFramebuffer(GL_READ_FRAMEBUFFER, _fbo);
else
glReadBuffer(GL_AUX0);
glDrawBuffer(GL_BACK);
glDisable(GL_BLEND);
glCopyPixels(0,0,800,600,GL_COLOR);
glEnable(GL_BLEND);
if (use_fbos)
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
else
glReadBuffer(GL_BACK);
}
static void hugsprim_glCopyPixels_2(HugsStackPtr hugs_root)
{
HsInt32 arg1;
HsInt32 arg2;
HsInt32 arg3;
HsInt32 arg4;
HsWord32 arg5;
arg1 = hugs->getInt32();
arg2 = hugs->getInt32();
arg3 = hugs->getInt32();
arg4 = hugs->getInt32();
arg5 = hugs->getWord32();
glCopyPixels(arg1, arg2, arg3, arg4, arg5);
hugs->returnIO(hugs_root,0);
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glBegin(GL_TRIANGLES);
glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(0.0f, 0.0f);
glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(1.0f, 0.0f);
glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(0.5f, 1.0f);
glEnd();
glPixelZoom(-0.5f, -0.5f);
glRasterPos2i(1, 1);
glCopyPixels(WindowWidth / 2, WindowHeight / 2,
WindowWidth / 2, WindowHeight / 2, GL_COLOR);
glutSwapBuffers();
grab();
}
/* Called when window needs to be redrawn */
void redraw(void)
{
glClear(GL_COLOR_BUFFER_BIT);
draw_dither();
glRasterPos2i(0, 0);
glPixelZoom(3.f, 3.f);
glDrawPixels(image_w, image_h, GL_RGBA, GL_UNSIGNED_BYTE, (GLubyte *)img);
glPixelZoom(1.f, 1.f);
glAccum(GL_ACCUM, -1.0);
glAccum(GL_RETURN, -1.f);
glRasterPos2i(0, 0);
glDrawBuffer(GL_FRONT); glReadBuffer(GL_FRONT);
pixel_map(1);
glCopyPixels(0, 0, 3*image_w, 3*image_h, GL_COLOR);
pixel_map(0);
CHECK_ERROR("redraw");
}
void
piglit_init(int argc, char **argv)
{
GLint max_samples;
GLuint rb, fb;
GLenum status;
bool pass = true;
piglit_require_extension("GL_EXT_framebuffer_multisample");
glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
glGenFramebuffersEXT(1, &fb);
glBindFramebufferEXT(GL_FRAMEBUFFER, fb);
glGenRenderbuffersEXT(1, &rb);
glBindRenderbufferEXT(GL_RENDERBUFFER, rb);
glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER, max_samples,
GL_RGBA, 1, 1);
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_RENDERBUFFER, rb);
glDrawBuffer(GL_COLOR_ATTACHMENT0);
glReadBuffer(GL_COLOR_ATTACHMENT0);
status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER);
if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
fprintf(stderr, "FBO incomplete\n");
piglit_report_result(PIGLIT_FAIL);
}
/* Finally, the actual test! */
glCopyPixels(0, 0, 1, 1, GL_COLOR);
if (!piglit_check_gl_error(GL_INVALID_OPERATION))
piglit_report_result(PIGLIT_FAIL);
glDeleteRenderbuffersEXT(1, &rb);
glDeleteFramebuffersEXT(1, &fb);
piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
}
void idle(void)
{
int x = curX - (wbrush/2);
int y = h - (curY + (hbrush/2));
int msecs;
static int last_msecs = -1;
/* do not do this more than 60 times a second. Otherwise it's
* to fast for use on high-end systems */
msecs = get_msecs();
if (fabs(last_msecs - msecs) < 1000./60.) {
return;
}
last_msecs = msecs;
/* we draw the brush using a drawpixels command. on systems with
* hardware-accelerated texture mapping it would be better to use
* that.
*
* we use the bitmap hack to set the rasterpos because we don't
* know that the position will be within the window.
*/
glRasterPos2i(0, 0);
glBitmap(0, 0, 0, 0, x, y, 0);
glColorMask(0, 0, 0, 1);
glDrawBuffer(GL_BACK);
glDrawPixels(wbrush, hbrush, GL_ALPHA, GL_UNSIGNED_BYTE, brush);
glColorMask(1, 1, 1, 1);
glReadBuffer(GL_BACK);
glDrawBuffer(GL_FRONT);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
glCopyPixels(x, y, wbrush, hbrush, GL_COLOR);
glDisable(GL_BLEND);
glColorMask(1, 1, 1, 1);
}
/*
==============
XY_Overlay
==============
*/
void XY_Overlay (void)
{
int w, h;
int r[4];
static vec3_t lastz;
static vec3_t lastcamera;
glViewport(0, 0, g_qeglobals.d_xy.width, g_qeglobals.d_xy.height);
//
// set up viewpoint
//
glMatrixMode(GL_PROJECTION);
glLoadIdentity ();
w = g_qeglobals.d_xy.width/2 / g_qeglobals.d_xy.scale;
h = g_qeglobals.d_xy.height/2 / g_qeglobals.d_xy.scale;
glOrtho (g_qeglobals.d_xy.origin[0] - w, g_qeglobals.d_xy.origin[0] + w
, g_qeglobals.d_xy.origin[1] - h, g_qeglobals.d_xy.origin[1] + h, -8000, 8000);
//
// erase the old camera and z checker positions
// if the entire xy hasn't been redrawn
//
if (g_qeglobals.d_xy.d_dirty)
{
glReadBuffer (GL_BACK);
glDrawBuffer (GL_FRONT);
glRasterPos2f (lastz[0]-9, lastz[1]-9);
glGetIntegerv (GL_CURRENT_RASTER_POSITION,r);
glCopyPixels(r[0], r[1], 18,18, GL_COLOR);
glRasterPos2f (lastcamera[0]-50, lastcamera[1]-50);
glGetIntegerv (GL_CURRENT_RASTER_POSITION,r);
glCopyPixels(r[0], r[1], 100,100, GL_COLOR);
}
g_qeglobals.d_xy.d_dirty = true;
//
// save off underneath where we are about to draw
//
VectorCopy (z.origin, lastz);
VectorCopy (camera.origin, lastcamera);
glReadBuffer (GL_FRONT);
glDrawBuffer (GL_BACK);
glRasterPos2f (lastz[0]-9, lastz[1]-9);
glGetIntegerv (GL_CURRENT_RASTER_POSITION,r);
glCopyPixels(r[0], r[1], 18,18, GL_COLOR);
glRasterPos2f (lastcamera[0]-50, lastcamera[1]-50);
glGetIntegerv (GL_CURRENT_RASTER_POSITION,r);
glCopyPixels(r[0], r[1], 100,100, GL_COLOR);
//
// draw the new icons
//
glDrawBuffer (GL_FRONT);
glShadeModel (GL_FLAT);
glDisable(GL_TEXTURE_2D);
glDisable(GL_TEXTURE_1D);
glDisable(GL_DEPTH_TEST);
glDisable(GL_BLEND);
glColor3f(0, 0, 0);
DrawCameraIcon ();
DrawZIcon ();
glDrawBuffer (GL_BACK);
glFinish();
}
/*
* PsychComposeCompressedStereoBuffer - Final compositing for compressed stereo.
*
* This routine copies both AUX buffers (0 and 1) back into the backbuffer, each of them
* vertically scaled/compressed by a factor of 2. Its called by PsychPreFlipOperations().
*/
void PsychComposeCompressedStereoBuffer(PsychWindowRecordType *windowRecord)
{
/*
if (FALSE) {
// Upload, setup and enable Anaglyph stereo fragment shader:
const float redgain=1.0, greengain=0.7, bluegain=0.0;
// This is the shader source code:
const char anaglyphshader[] =
"!!ARBfp1.0 "
"PARAM ColorToGrayWeights = { 0.3, 0.59, 0.11, 1.0 }; "
"TEMP luminance; "
"TEMP incolor;"
//"MOV incolor, fragment.color;"
"TEX incolor, fragment.texcoord[0], texture[0], RECT;"
"DP3 luminance, incolor, ColorToGrayWeights; "
"MUL result.color.rgb, luminance, program.env[0]; "
"MOV result.color.a, ColorToGrayWeights.a; "
//"MOV result.color.a, fragment.color.a; "
"END";
// Upload and compile shader:
PsychTestForGLErrors();
glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB, strlen(anaglyphshader), anaglyphshader);
PsychTestForGLErrors();
// Setup the rgb-gains as global parameters for the shader:
glProgramEnvParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 0, redgain, greengain, bluegain, 0.0);
// Enable the shader:
glEnable(GL_FRAGMENT_PROGRAM_ARB);
}
*/
// Query screen dimension:
int screenwidth=(int) PsychGetWidthFromRect(windowRecord->rect);
int screenheight=(int) PsychGetHeightFromRect(windowRecord->rect);
// When entering this routine, the modelview matrix is already set to identity and
// the proper OpenGL context is active.
// Set up zoom for vertical compression:
glPixelZoom(1, 0.5f);
glDrawBuffer(GL_BACK);
glDisable(GL_BLEND);
// Draw left view aka AUX0:
glReadBuffer(GL_AUX0);
glRasterPos2i(0, (windowRecord->stereomode==kPsychCompressedTLBRStereo) ? screenheight/2 : screenheight);
glCopyPixels(0, 0, screenwidth, screenheight, GL_COLOR);
// Draw right view aka AUX1:
glReadBuffer(GL_AUX1);
glRasterPos2i(0, (windowRecord->stereomode==kPsychCompressedTLBRStereo) ? screenheight : screenheight/2);
glCopyPixels(0, 0, screenwidth, screenheight, GL_COLOR);
// Restore settings:
glReadBuffer(GL_BACK);
glPixelZoom(1,1);
glEnable(GL_BLEND);
// Unconditionally disable fragment shaders:
// glDisable(GL_FRAGMENT_PROGRAM_ARB);
// Done.
return;
}
static void
Display( void )
{
glClearColor(.3, .3, .3, 1);
glClear( GL_COLOR_BUFFER_BIT );
CheckError(__LINE__);
/** Unbind UNPACK pixel buffer before calling glBitmap */
glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, 0);
glRasterPos2i(5, ImgHeight+25);
PrintString("f = toggle front/back s = toggle scale/bias b = benchmark");
glRasterPos2i(5, ImgHeight+40);
PrintString("GL_EXT_pixel_buffer_object test");
/* draw original image */
glRasterPos2i(APosX, 5);
PrintString("Original");
glRasterPos2i(APosX, APosY);
glEnable(GL_DITHER);
SetupPixelTransfer(GL_FALSE);
/*** Draw from the DrawPBO */
glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, DrawPBO);
glDrawPixels(ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, 0);
glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, 0);
CheckError(__LINE__);
/* do readpixels, drawpixels */
glRasterPos2i(BPosX, 5);
PrintString("Read/DrawPixels");
SetupPixelTransfer(ScaleAndBias);
/*** read into the Temp PBO */
glBindBufferARB(GL_PIXEL_PACK_BUFFER_EXT, TempPBO);
CheckError(__LINE__);
if (Benchmark) {
GLint reads = 0;
GLint endTime;
GLint startTime = glutGet(GLUT_ELAPSED_TIME);
GLdouble seconds, pixelsPerSecond;
printf("Benchmarking...\n");
do {
glReadPixels(APosX, APosY, ImgWidth, ImgHeight,
ReadFormat, ReadType, 0);
reads++;
endTime = glutGet(GLUT_ELAPSED_TIME);
} while (endTime - startTime < 4000); /* 4 seconds */
seconds = (double) (endTime - startTime) / 1000.0;
pixelsPerSecond = reads * ImgWidth * ImgHeight / seconds;
printf("Result: %d reads in %f seconds = %f pixels/sec\n",
reads, seconds, pixelsPerSecond);
Benchmark = GL_FALSE;
}
else {
glReadPixels(APosX, APosY, ImgWidth, ImgHeight,
ReadFormat, ReadType, 0);
}
CheckError(__LINE__);
glRasterPos2i(BPosX, BPosY);
glDisable(GL_DITHER);
SetupPixelTransfer(GL_FALSE);
CheckError(__LINE__);
/*** draw from the Temp PBO */
glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, TempPBO);
glDrawPixels(ImgWidth, ImgHeight, ReadFormat, ReadType, 0);
glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, 0);
CheckError(__LINE__);
/* do copypixels */
glRasterPos2i(CPosX, 5);
PrintString("CopyPixels");
glRasterPos2i(CPosX, CPosY);
glDisable(GL_DITHER);
SetupPixelTransfer(ScaleAndBias);
glCopyPixels(APosX, APosY, ImgWidth, ImgHeight, GL_COLOR);
CheckError(__LINE__);
if (!DrawFront)
glutSwapBuffers();
else
glFinish();
}
static void
Display( void )
{
glClearColor(.3, .3, .3, 1);
glClear( GL_COLOR_BUFFER_BIT );
glRasterPos2i(5, ImgHeight+25);
PrintString("f = toggle front/back s = toggle scale/bias b = benchmark");
/* draw original image */
glRasterPos2i(APosX, 5);
PrintString("Original");
if (!Triangle) {
glRasterPos2i(APosX, APosY);
glEnable(GL_DITHER);
SetupPixelTransfer(GL_FALSE);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glDrawPixels(ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, Image);
}
else {
float z = 0;
glViewport(APosX, APosY, ImgWidth, ImgHeight);
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
glDisable(GL_CULL_FACE);
/* Red should never be seen
*/
glBegin(GL_POLYGON);
glColor3f(1,0,0);
glVertex3f(-2, -2, z);
glVertex3f(-2, 2, z);
glVertex3f(2, 2, z);
glVertex3f(2, -2, z);
glEnd();
/* Blue background
*/
glBegin(GL_POLYGON);
glColor3f(.5,.5,1);
glVertex3f(-1, -1, z);
glVertex3f(-1, 1, z);
glVertex3f(1, 1, z);
glVertex3f(1, -1, z);
glEnd();
/* Triangle
*/
glBegin(GL_TRIANGLES);
glColor3f(.8,0,0);
glVertex3f(-0.9, -0.9, z);
glColor3f(0,.9,0);
glVertex3f( 0.9, -0.9, z);
glColor3f(0,0,.7);
glVertex3f( 0.0, 0.9, z);
glEnd();
glColor3f(1,1,1);
glViewport( 0, 0, WinWidth, WinHeight );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glOrtho( 0.0, WinWidth, 0.0, WinHeight, -1.0, 1.0 );
}
/* might try alignment=4 here for testing */
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
/* do readpixels, drawpixels */
glRasterPos2i(BPosX, 5);
PrintString("Read/DrawPixels");
SetupPixelTransfer(ScaleAndBias);
if (Benchmark) {
GLint reads = 0;
GLint endTime;
GLint startTime = glutGet(GLUT_ELAPSED_TIME);
GLdouble seconds, mpixels, mpixelsPerSecond;
printf("Benchmarking...\n");
do {
glReadPixels(APosX, APosY, ImgWidth, ImgHeight,
ReadFormat, ReadType, TempImage);
reads++;
endTime = glutGet(GLUT_ELAPSED_TIME);
} while (endTime - startTime < 4000); /* 4 seconds */
seconds = (double) (endTime - startTime) / 1000.0;
mpixels = reads * (ImgWidth * ImgHeight / (1000.0 * 1000.0));
mpixelsPerSecond = mpixels / seconds;
printf("Result: %d reads in %f seconds = %f Mpixels/sec\n",
reads, seconds, mpixelsPerSecond);
Benchmark = GL_FALSE;
}
else {
/* clear the temporary image to white (helpful for debugging */
memset(TempImage, 255, ImgWidth * ImgHeight * 4);
#if 1
glReadPixels(APosX, APosY, ImgWidth, ImgHeight,
ReadFormat, ReadType, TempImage);
(void) ComplexReadPixels;
#else
/* you might use this when debugging */
ComplexReadPixels(APosX, APosY, ImgWidth, ImgHeight,
ReadFormat, ReadType, TempImage);
#endif
}
glRasterPos2i(BPosX, BPosY);
glDisable(GL_DITHER);
SetupPixelTransfer(GL_FALSE);
glDrawPixels(ImgWidth, ImgHeight, ReadFormat, ReadType, TempImage);
/* do copypixels */
glRasterPos2i(CPosX, 5);
PrintString("CopyPixels");
glRasterPos2i(CPosX, CPosY);
glDisable(GL_DITHER);
SetupPixelTransfer(ScaleAndBias);
glCopyPixels(APosX, APosY, ImgWidth, ImgHeight, GL_COLOR);
if (!DrawFront)
glutSwapBuffers();
else
glFinish();
}
void
eventLoop (void)
{
XEvent event;
struct pollfd ufd;
int timeDiff;
struct timeval tv;
Region tmpRegion;
CompDisplay *display = compDisplays;
CompScreen *s = display->screens;
int timeToNextRedraw = 0;
CompWindow *move = 0;
int px = 0, py = 0;
CompTimeout *t;
tmpRegion = XCreateRegion ();
if (!tmpRegion)
{
fprintf (stderr, "%s: Couldn't create region\n", programName);
return;
}
ufd.fd = ConnectionNumber (display->display);
ufd.events = POLLIN;
for (;;)
{
if (display->dirtyPluginList)
updatePlugins (display);
if (restartSignal)
{
execvp (programName, programArgv);
exit (1);
}
while (XPending (display->display))
{
XNextEvent (display->display, &event);
/* translate root window */
if (testMode)
{
Window root, child;
switch (event.type) {
case ButtonPress:
if (!move)
{
px = event.xbutton.x;
py = event.xbutton.y;
move = findWindowAt (display, event.xbutton.window,
px, py);
if (move)
{
XRaiseWindow (display->display, move->id);
continue;
}
}
case ButtonRelease:
move = 0;
root = translateToRootWindow (display,
event.xbutton.window);
XTranslateCoordinates (display->display,
event.xbutton.root, root,
event.xbutton.x_root,
event.xbutton.y_root,
&event.xbutton.x_root,
&event.xbutton.y_root,
&child);
event.xbutton.root = root;
break;
case KeyPress:
case KeyRelease:
root = translateToRootWindow (display, event.xkey.window);
XTranslateCoordinates (display->display,
event.xkey.root, root,
event.xkey.x_root,
event.xkey.y_root,
&event.xkey.x_root,
&event.xkey.y_root,
&child);
event.xkey.root = root;
break;
case MotionNotify:
if (move)
{
XMoveWindow (display->display, move->id,
move->attrib.x + event.xbutton.x - px,
move->attrib.y + event.xbutton.y - py);
px = event.xbutton.x;
py = event.xbutton.y;
continue;
}
root = translateToRootWindow (display,
event.xmotion.window);
XTranslateCoordinates (display->display,
event.xmotion.root, root,
event.xmotion.x_root,
event.xmotion.y_root,
&event.xmotion.x_root,
&event.xmotion.y_root,
&child);
event.xmotion.root = root;
default:
break;
}
}
/* add virtual modifiers */
switch (event.type) {
case ButtonPress:
event.xbutton.state |= CompPressMask;
event.xbutton.state =
realToVirtualModMask (display, event.xbutton.state);
break;
case ButtonRelease:
event.xbutton.state |= CompReleaseMask;
event.xbutton.state =
realToVirtualModMask (display, event.xbutton.state);
break;
case KeyPress:
event.xkey.state |= CompPressMask;
event.xkey.state = realToVirtualModMask (display,
event.xkey.state);
break;
case KeyRelease:
event.xkey.state |= CompReleaseMask;
event.xkey.state = realToVirtualModMask (display,
event.xkey.state);
break;
case MotionNotify:
event.xmotion.state =
realToVirtualModMask (display, event.xmotion.state);
break;
default:
break;
}
(*display->handleEvent) (display, &event);
}
if (s->allDamaged || REGION_NOT_EMPTY (s->damage))
{
if (timeToNextRedraw == 0)
{
/* wait for X drawing requests to finish
glXWaitX (); */
gettimeofday (&tv, 0);
timeDiff = TIMEVALDIFF (&tv, &s->lastRedraw);
(*s->preparePaintScreen) (s, timeDiff);
if (s->allDamaged)
{
EMPTY_REGION (s->damage);
s->allDamaged = 0;
(*s->paintScreen) (s,
&defaultScreenPaintAttrib,
&defaultWindowPaintAttrib,
&s->region,
PAINT_SCREEN_REGION_MASK |
PAINT_SCREEN_FULL_MASK);
glXSwapBuffers (s->display->display, s->root);
}
else
{
XIntersectRegion (s->damage, &s->region, tmpRegion);
EMPTY_REGION (s->damage);
if ((*s->paintScreen) (s,
&defaultScreenPaintAttrib,
&defaultWindowPaintAttrib,
tmpRegion,
PAINT_SCREEN_REGION_MASK))
{
BoxPtr pBox;
int nBox, y;
glEnable (GL_SCISSOR_TEST);
glDrawBuffer (GL_FRONT);
pBox = tmpRegion->rects;
nBox = tmpRegion->numRects;
while (nBox--)
{
y = s->height - pBox->y2;
glBitmap (0, 0, 0, 0,
pBox->x1 - s->rasterX, y - s->rasterY,
NULL);
s->rasterX = pBox->x1;
s->rasterY = y;
glScissor (pBox->x1, y,
pBox->x2 - pBox->x1,
pBox->y2 - pBox->y1);
glCopyPixels (pBox->x1, y,
pBox->x2 - pBox->x1,
pBox->y2 - pBox->y1,
GL_COLOR);
pBox++;
}
glDrawBuffer (GL_BACK);
glDisable (GL_SCISSOR_TEST);
glFlush ();
}
else
{
(*s->paintScreen) (s,
&defaultScreenPaintAttrib,
&defaultWindowPaintAttrib,
&s->region,
PAINT_SCREEN_FULL_MASK);
glXSwapBuffers (s->display->display, s->root);
}
}
s->lastRedraw = tv;
(*s->donePaintScreen) (s);
/* remove destroyed windows */
while (s->pendingDestroys)
{
CompWindow *w;
for (w = s->windows; w; w = w->next)
{
if (w->destroyed)
{
addWindowDamage (w);
removeWindow (w);
break;
}
}
s->pendingDestroys--;
}
}
timeToNextRedraw = getTimeToNextRedraw (s, &s->lastRedraw);
if (timeToNextRedraw)
timeToNextRedraw = poll (&ufd, 1, timeToNextRedraw);
}
else
{
if (timeouts)
{
if (timeouts->left > 0)
poll (&ufd, 1, timeouts->left);
gettimeofday (&tv, 0);
timeDiff = TIMEVALDIFF (&tv, &lastTimeout);
for (t = timeouts; t; t = t->next)
t->left -= timeDiff;
while (timeouts && timeouts->left <= 0)
{
t = timeouts;
if ((*t->callBack) (t->closure))
{
timeouts = t->next;
addTimeout (t);
}
else
{
timeouts = t->next;
free (t);
}
}
s->lastRedraw = lastTimeout = tv;
}
else
{
poll (&ufd, 1, 1000);
gettimeofday (&s->lastRedraw, 0);
}
/* just redraw immediately */
timeToNextRedraw = 0;
}
}
}
/* Draw several things that should generate fragments, each within an
* occlusion query. Then verify that each query returns a non-zero
* value.
*/
enum piglit_result
piglit_display(void)
{
/* 2x2 data: Red, Green, Blue, and White. */
float data[16] = { 1.0, 0.0, 0.0,
0.0, 1.0, 0.0,
0.0, 0.0, 1.0,
1.0, 1.0, 1.0 };
GLubyte bitmap[16] = { 0x5f, 0xff, 0xff, 0xff,
0xAf, 0xff, 0xff, 0xff,
0x5f, 0xff, 0xff, 0xff,
0xAf, 0xff, 0xff, 0xff };
GLuint query;
int test_pass = 1;
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
glClearColor(0.0, 1.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glGenQueries(1, &query);
/* Fragments for glDrawPixels
*
* Assuming one fragment per pixel based on:
*
* Rectangles of color, depth, and certain
* other values may be converted to fragments
* using the DrawPixels command. [OpenGL 3.0 § 3.7]
*/
glBeginQuery(GL_SAMPLES_PASSED, query);
{
glRasterPos2i(2, 2);
glDrawPixels(2, 2, GL_RGB, GL_FLOAT, data);
}
glEndQuery(GL_SAMPLES_PASSED);
test_pass &= verify_fragments(query, "glDrawPixels", 4);
/* Fragments for glCopyPixels
*
* And here, CopyPixels is specified to behave
* identically to DrawPixels:
*
* The groups of elements so obtained are then
* written to the framebuffer just as if
* DrawPixels had been given width and height,
* beginning with final conversion of elements.
* [OpenGL 3.0 § 4.3.3]
*/
glBeginQuery(GL_SAMPLES_PASSED, query);
{
glRasterPos2i(6, 2);
glCopyPixels(2, 2, 2, 2, GL_COLOR);
}
glEndQuery(GL_SAMPLES_PASSED);
test_pass &= verify_fragments(query, "glCopyPixels", 4);
/* Fragments for glBitmap.
*
* The specification implies very strongly that a bitmap
* should generate one fragment per set bit:
*
* Bitmaps are rectangles of zeros and ones
* specifying a particular pattern of frag-
* ments to be produced. [OpenGL 3.0 § 3.8]
*/
glBeginQuery(GL_SAMPLES_PASSED, query);
{
glRasterPos2i(10, 2);
glColor4f(0.0, 0.0, 1.0, 0.0);
glBitmap(4, 4, 0, 0, 0, 0, bitmap);
}
glEndQuery(GL_SAMPLES_PASSED);
test_pass &= verify_fragments(query, "glBitmap", 8);
glDeleteQueries(1, &query);
piglit_present_results();
return test_pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
static void
Display( void )
{
glClearColor(.3, .3, .3, 1);
glClear( GL_COLOR_BUFFER_BIT );
glRasterPos2i(5, ImgHeight+25);
PrintString("f = toggle front/back s = toggle scale/bias b = benchmark");
/* draw original image */
glRasterPos2i(APosX, 5);
PrintString("Original");
glRasterPos2i(APosX, APosY);
glEnable(GL_DITHER);
SetupPixelTransfer(GL_FALSE);
glDrawPixels(ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, Image);
/* do readpixels, drawpixels */
glRasterPos2i(BPosX, 5);
PrintString("Read/DrawPixels");
SetupPixelTransfer(ScaleAndBias);
if (Benchmark) {
GLint reads = 0;
GLint endTime;
GLint startTime = glutGet(GLUT_ELAPSED_TIME);
GLdouble seconds, pixelsPerSecond;
printf("Benchmarking...\n");
do {
glReadPixels(APosX, APosY, ImgWidth, ImgHeight,
ReadFormat, ReadType, TempImage);
reads++;
endTime = glutGet(GLUT_ELAPSED_TIME);
} while (endTime - startTime < 4000); /* 4 seconds */
seconds = (double) (endTime - startTime) / 1000.0;
pixelsPerSecond = reads * ImgWidth * ImgHeight / seconds;
printf("Result: %d reads in %f seconds = %f pixels/sec\n",
reads, seconds, pixelsPerSecond);
Benchmark = GL_FALSE;
}
else {
/* clear the temporary image to white (helpful for debugging */
memset(TempImage, 255, ImgWidth * ImgHeight * 4);
glReadPixels(APosX, APosY, ImgWidth, ImgHeight,
ReadFormat, ReadType, TempImage);
}
glRasterPos2i(BPosX, BPosY);
glDisable(GL_DITHER);
SetupPixelTransfer(GL_FALSE);
glDrawPixels(ImgWidth, ImgHeight, ReadFormat, ReadType, TempImage);
/* do copypixels */
glRasterPos2i(CPosX, 5);
PrintString("CopyPixels");
glRasterPos2i(CPosX, CPosY);
glDisable(GL_DITHER);
SetupPixelTransfer(ScaleAndBias);
glCopyPixels(APosX, APosY, ImgWidth, ImgHeight, GL_COLOR);
if (!DrawFront)
glutSwapBuffers();
else
glFinish();
}
static void
display(void)
{
int i;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
if (textureEnabled) {
if (mode == MoveTexture || mode == MoveView) {
/* Have OpenGL compute the new transformation (simple but slow). */
for (i = 0; i < NumTextures; i++) {
glPushMatrix();
glLoadIdentity();
#if 0
if (i & 1)
glRotatef(angle, axis[0], axis[1], axis[2]);
else
#endif
glRotatef(angle*(i+1), axis[0], axis[1], axis[2]);
glMultMatrixf((GLfloat *) textureXform[i]);
glGetFloatv(GL_MODELVIEW_MATRIX, (GLfloat *) textureXform[i]);
glPopMatrix();
}
}
for (i = 0; i < NumTextures; i++) {
loadTextureProjection(i, (GLfloat *) textureXform[i]);
}
if (showProjection) {
for (i = 0; i < NumTextures; i++) {
ActiveTexture(GL_TEXTURE0_ARB + i);
glPushMatrix();
glMultMatrixf((GLfloat *) textureXform[i]);
glDisable(GL_LIGHTING);
drawTextureProjection();
glEnable(GL_LIGHTING);
glPopMatrix();
}
}
for (i = 0; i < NumTextures; i++) {
ActiveTexture(GL_TEXTURE0_ARB + i);
glEnable(GL_TEXTURE_2D);
glEnable(GL_TEXTURE_GEN_S);
glEnable(GL_TEXTURE_GEN_T);
glEnable(GL_TEXTURE_GEN_R);
glEnable(GL_TEXTURE_GEN_Q);
}
}
if (mode == MoveObject || mode == MoveView) {
/* Have OpenGL compute the new transformation (simple but slow). */
glPushMatrix();
glLoadIdentity();
glRotatef(angle, axis[0], axis[1], axis[2]);
glMultMatrixf((GLfloat *) objectXform);
glGetFloatv(GL_MODELVIEW_MATRIX, (GLfloat *) objectXform);
glPopMatrix();
}
glPushMatrix();
glMultMatrixf((GLfloat *) objectXform);
(*drawObject) ();
glPopMatrix();
for (i = 0; i < NumTextures; i++) {
ActiveTexture(GL_TEXTURE0_ARB + i);
glDisable(GL_TEXTURE_2D);
glDisable(GL_TEXTURE_GEN_S);
glDisable(GL_TEXTURE_GEN_T);
glDisable(GL_TEXTURE_GEN_R);
glDisable(GL_TEXTURE_GEN_Q);
}
if (zoomFactor > 1.0) {
glDisable(GL_DEPTH_TEST);
glCopyPixels(0, 0, winWidth / zoomFactor, winHeight / zoomFactor, GL_COLOR);
glEnable(GL_DEPTH_TEST);
}
glFlush();
glutSwapBuffers();
checkErrors();
}
void compute_matte(void)
{
glClear(GL_ACCUM_BUFFER_BIT);
/* draw rectangle in (key color + 1) / 2 */
glBegin(GL_QUADS);
glColor3f(key[0], key[1], key[2]);
glVertex2f(0, 0);
glVertex2f(w, 0);
glVertex2f(w, h);
glVertex2f(0, h);
glEnd();
glFlush();
/* negate & accumulate */
glAccum(GL_LOAD, -1);
/* compute & return (image - key) */
glRasterPos2f(0, 0);
glDrawPixels(w, h, GL_RGBA, GL_UNSIGNED_BYTE, img0);
glAccum(GL_ACCUM, 1);
glAccum(GL_RETURN, 1);
/* move to right hand side of window */
glRasterPos2f(w, 0);
glCopyPixels(0, 0, w, h, GL_COLOR);
/* compute & return (key - image) */
glEnable(GL_SCISSOR_TEST);
glScissor(0, 0, w, h);
glAccum(GL_MULT, -1);
glAccum(GL_RETURN, 1);
glScissor(0, 0, 2*w, h);
glDisable(GL_SCISSOR_TEST);
/* assemble to get fabs(key - image) */
glBlendFunc(GL_ONE, GL_ONE);
glEnable(GL_BLEND);
glRasterPos2i(0, 0);
glCopyPixels(w, 0, w, h, GL_COLOR);
glDisable(GL_BLEND);
/* assemble into alpha channel */
{
GLfloat mat[] = {
RW, RW, RW, RW,
GW, GW, GW, GW,
BW, BW, BW, BW,
0, 0, 0, 0,
};
glMatrixMode(GL_COLOR);
glLoadMatrixf(mat);
glRasterPos2i(w, 0);
glCopyPixels(0, 0, w, h, GL_COLOR);
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
/* do a second copy because sbias comes after color matrix in the
* transfer pipeline. could avoid this by using the post color matrix
* scale bias... */
if (upperfudge - lowerfudge) {
glPixelTransferf(GL_ALPHA_SCALE, 1./(upperfudge - lowerfudge));
glPixelTransferf(GL_ALPHA_BIAS, -lowerfudge/(upperfudge - lowerfudge));
} else {
/* move such that upper/lowerfudge maps to .5, then quantize with
* 2-entry pixel map. */
GLushort quantize[] = {0, 0xffff};
glPixelTransferf(GL_ALPHA_BIAS, .5 - upperfudge);
glPixelMapusv(GL_PIXEL_MAP_A_TO_A, 2, quantize);
glPixelTransferi(GL_MAP_COLOR, 1);
}
glRasterPos2i(w, 0);
glCopyPixels(w, 0, w, h, GL_COLOR);
glPixelTransferf(GL_ALPHA_SCALE, 1);
glPixelTransferf(GL_ALPHA_BIAS, 0);
glPixelTransferi(GL_MAP_COLOR, 0);
}
/* copy matte to right */
glRasterPos2i(0, 0);
glCopyPixels(w, 0, w, h, GL_COLOR);
/* draw the third image */
glColorMask(1, 1, 1, 0);
glRasterPos2i(w, 0);
glDrawPixels(w, h, GL_RGBA, GL_UNSIGNED_BYTE, img2);
glColorMask(1, 1, 1, 1);
glBlendFunc(GL_DST_ALPHA, GL_ONE_MINUS_DST_ALPHA);
glEnable(GL_BLEND);
glRasterPos2i(w, 0);
glDrawPixels(w, h, GL_RGBA, GL_UNSIGNED_BYTE, img1);
/* this is for matte display... */
glColor3f(1, 1, 1);
glBegin(GL_QUADS);
glVertex2f(0, 0);
glVertex2f(w, 0);
glVertex2f(w, h);
glVertex2f(0, h);
glEnd();
glDisable(GL_BLEND);
}