fbo-mipmap-copypix: Test glRead/Draw/CopyPixels accessing mipmap levels

1 files changed, 273 insertions, 0 deletions

diff --git a/tests/fbo/fbo-mipmap-copypix.c b/tests/fbo/fbo-mipmap-copypix.c
new file mode 100644
index 000000000..84f9f41cd
--- /dev/null
+++ b/tests/fbo/fbo-mipmap-copypix.c
@@ -0,0 +1,273 @@
+/*
+ * Copyright (c) 2011 VMware, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/*
+ * Test copying images between texture mipmap levels using FBOs.
+ * Test glCopyPixels and glReadPixels+glDrawPixels.
+ * Test with and without pixel transfer.
+ * Test with same/different src/dest texture formats.
+ *
+ * Brian Paul
+ * May 25, 2011
+ */
+
+#include "piglit-util.h"
+
+
+int piglit_width = 50, piglit_height = 50;
+int piglit_window_mode = GLUT_DOUBLE | GLUT_RGB;
+
+static const GLuint NumLevels = 10;
+
+static const GLfloat colors[10][4] = {
+   { 1, 0, 0, 1 },
+   { 0, 1, 0, 1 },
+   { 0, 0, 1, 1 },
+   { 0, 1, 1, 1 },
+   { 1, 0, 1, 1 },
+   { 1, 1, 0, 1 },
+   { 1, 1, 1, 1 },
+   { .5, .5, .5, 1 },
+   { 0, 1, .5, 1 },
+   { .5, 0, 1, 1 }
+};
+
+
+static GLuint
+create_texture(GLboolean fillInColors, GLenum intFormat)
+{
+   GLuint tex, level, size, i;
+   GLfloat *image;
+
+   glGenTextures(1, &tex);
+
+   glBindTexture(GL_TEXTURE_2D, tex);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+   /* level 0 size */
+   size = 1 << (NumLevels - 1);
+
+   image = malloc(size * size * 4 * sizeof(GLfloat));
+
+   if (!fillInColors) {
+      /* Set image to black */
+      memset(image, 0, size * size * 4 * sizeof(GLfloat));
+   }
+
+   for (level = 0; level < NumLevels; level++) {
+      assert(size >= 1);
+
+      if (fillInColors) {
+         /* fill in src image with specific color */
+         for (i = 0; i < size * size; i++) {
+            image[i*4+0] = colors[level][0];
+            image[i*4+1] = colors[level][1];
+            image[i*4+2] = colors[level][2];
+            image[i*4+3] = colors[level][3];
+         }
+      }
+
+      glTexImage2D(GL_TEXTURE_2D, level, intFormat,
+                   size, size, 0, GL_RGBA, GL_FLOAT, image);
+
+      size /= 2;
+   }
+
+   free(image);
+
+   return tex;
+}
+
+
+static GLboolean
+test_mipmap_copypixels(GLenum srcIntFormat, GLenum dstIntFormat,
+                       GLboolean doPixelTransfer, GLboolean useReadDrawPix)
+{
+   GLuint srcTex, dstTex;
+   GLuint fboSrc, fboDst;
+   GLuint level, size;
+   GLboolean pass = GL_TRUE;
+   GLenum status;
+
+   if (doPixelTransfer) {
+      glPixelTransferf(GL_ALPHA_SCALE, 0.0000001);
+      glPixelTransferf(GL_ALPHA_BIAS, 1.0);
+   }
+
+   srcTex = create_texture(GL_TRUE, srcIntFormat);
+   dstTex = create_texture(GL_FALSE, dstIntFormat);
+
+   glGenFramebuffers(1, &fboSrc);
+   glGenFramebuffers(1, &fboDst);
+
+   size = 1 << (NumLevels - 1);
+
+   for (level = 0; level < NumLevels; level++) {
+      /* setup src */
+      glBindFramebuffer(GL_READ_FRAMEBUFFER, fboSrc);
+      glFramebufferTexture2D(GL_READ_FRAMEBUFFER,
+                             GL_COLOR_ATTACHMENT0,
+                             GL_TEXTURE_2D,
+                             srcTex,
+                             level);
+
+      status = glCheckFramebufferStatus(GL_READ_FRAMEBUFFER);
+      if (status != GL_FRAMEBUFFER_COMPLETE) {
+         fprintf(stderr, "Source FBO incomplete for level %u (0x%x)\n",
+                 level, status);
+         pass = GL_FALSE;
+         break;
+      }
+
+      /* setup dest */
+      glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fboDst);
+      glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER,
+                             GL_COLOR_ATTACHMENT0,
+                             GL_TEXTURE_2D,
+                             dstTex,
+                             level);
+
+      status = glCheckFramebufferStatus(GL_DRAW_FRAMEBUFFER);
+      if (status != GL_FRAMEBUFFER_COMPLETE) {
+         fprintf(stderr, "Dest FBO incomplete for level %u (0x%x)\n",
+                 level, status);
+         pass = GL_FALSE;
+         break;
+      }
+
+      glReadBuffer(GL_COLOR_ATTACHMENT0);
+      glDrawBuffer(GL_COLOR_ATTACHMENT0);
+
+      /* copy from src mipmap level to dest */
+      if (useReadDrawPix) {
+         GLubyte *tmp = (GLubyte *) malloc(size * size * 4 * sizeof(GLubyte));
+         glReadPixels(0, 0, size, size, GL_RGBA, GL_UNSIGNED_BYTE, tmp);
+         if (0)
+            printf("copy color %u %u %u %u\n", tmp[0], tmp[1], tmp[2], tmp[3]);
+         glDrawPixels(size, size, GL_RGBA, GL_UNSIGNED_BYTE, tmp);
+         free(tmp);
+      }
+      else {
+         glCopyPixels(0, 0, size, size, GL_COLOR);
+      }
+
+      size /= 2;
+   }
+
+   /* restore */
+   glPixelTransferf(GL_ALPHA_SCALE, 1.0);
+   glPixelTransferf(GL_ALPHA_BIAS, 0.0);
+
+   glDeleteFramebuffers(1, &fboSrc);
+   glDeleteFramebuffers(1, &fboDst);
+
+   glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+   if (!pass)
+      return GL_FALSE;
+
+   /* Draw with dest texture and test the color */
+   glBindTexture(GL_TEXTURE_2D, dstTex);
+   glEnable(GL_TEXTURE_2D);
+   glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+
+   size = 1 << (NumLevels - 1);
+
+   for (level = 0; level < NumLevels; level++) {
+      GLboolean p;
+
+      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_LOD, level);
+      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, level);
+
+      glClear(GL_COLOR_BUFFER_BIT);
+
+      piglit_draw_rect_tex(0, 0, piglit_width, piglit_height,
+                           0.0, 0.0, 1.0, 1.0);
+
+      glutSwapBuffers();
+
+      p = piglit_probe_pixel_rgba(piglit_width/2, piglit_height/2, colors[level]);
+      if (!p) {
+         printf("  Mipmap level %d\n", level);
+         if (useReadDrawPix)
+            printf("  Using glRead/DrawPixels()\n");
+         else
+            printf("  Using glCopyPixels()\n");
+         if (srcIntFormat == dstIntFormat)
+            printf("  Matching src/dest texture formats\n");
+         else
+            printf("  Different src/dest texture formats\n");
+         if (doPixelTransfer)
+            printf("  With pixel transfer enabled\n");
+         pass = GL_FALSE;
+      }
+
+      size /= 2;
+   }
+
+   glDisable(GL_TEXTURE_2D);
+
+   glDeleteTextures(1, &srcTex);
+   glDeleteTextures(1, &dstTex);
+
+   return pass;
+}
+
+
+enum piglit_result
+piglit_display(void)
+{
+   GLboolean pass = GL_TRUE;
+   GLint formats, pixelTransfer, readDrawPix;
+
+   for (formats = 0; formats < 2; formats++) {
+      for (pixelTransfer = 0; pixelTransfer < 2; pixelTransfer++) {
+         for (readDrawPix = 0; readDrawPix < 2; readDrawPix++) {
+            GLenum srcFmt, dstFmt;
+
+            if (formats == 0) {
+               srcFmt = dstFmt = GL_RGBA;
+            }
+            else {
+               srcFmt = GL_RGBA8;
+               dstFmt = GL_RGB10_A2;
+            }
+
+            pass = test_mipmap_copypixels(srcFmt, dstFmt,
+                                          pixelTransfer, readDrawPix) && pass;
+         }
+      }
+   }
+
+   return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+
+void
+piglit_init(int argc, char **argv)
+{
+   piglit_require_extension("GL_ARB_framebuffer_object");
+   piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
+   glClearColor(0.5, 0.5, 0.5, 0.5);
+}