New test: texturing/gen-texsubimage

Tests that SGIS_generate_mipmap occurs after TexSubImage.  Catches bug #17077.

tests/all.tests

@@ -86,6 +86,7 @@ bugs['tex1d-2dborder'] = PlainExecTest([testBinDir + 'tex1d-2dborder', '-auto'])
 texturing = Group()
 texturing['copytexsubimage'] = PlainExecTest([testBinDir + 'copytexsubimage', '-auto'])
 texturing['cubemap'] = PlainExecTest([testBinDir + 'cubemap', '-auto'])
+texturing['gen-texsubimage'] = PlainExecTest([testBinDir + 'gen-texsubimage', '-auto'])
 texturing['lodbias'] = PlainExecTest([testBinDir + 'lodbias', '-auto'])
 texturing['tex3d'] = PlainExecTest([testBinDir + 'tex3d'])
 texturing['texdepth'] = PlainExecTest([testBinDir + 'texdepth', '-auto'])

tests/texturing/CMakeLists.txt

@@ -20,6 +20,7 @@ link_libraries (
 
 add_executable (copytexsubimage copytexsubimage.c)
 add_executable (cubemap cubemap.c)
+add_executable (gen-texsubimage gen-texsubimage.c)
 add_executable (lodbias lodbias.c)
 add_executable (tex3d tex3d.c)
 add_executable (texdepth texdepth.c)

tests/texturing/gen-texsubimage.c

+/*
+ * Copyright © 2008 Intel Corporation
+ *
+ * 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.
+ *
+ * Authors:
+ *    Chris Lord <chris@openedhand.com>
+ *    Eric Anholt <eric@anholt.net>
+ *
+ */
+
+/** @file gen-texsubimage.c
+ *
+ * Tests that the full mipmap tree is correctly updated after calling
+ * glTexSubImage() when GL_GENERATE_MIPMAP is enabled.  Based on a test
+ * in bug #17077.
+ */
+
+#include "GL/glut.h"
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <math.h>
+#include "piglit-util.h"
+
+#define WIN_WIDTH 512
+#define WIN_HEIGHT 512
+
+static GLboolean Automatic = GL_FALSE;
+
+static void display_mipmaps(int start_x, int start_y)
+{
+	int i;
+
+	/* Disply all the mipmap levels */
+	for (i = 256; i > 0; i /= 2) {
+		glBegin(GL_QUADS);
+		glTexCoord2f(0.0, 0.0); glVertex2f(start_x + 0, start_y + 0);
+		glTexCoord2f(1.0, 0.0); glVertex2f(start_x + i, start_y + 0);
+		glTexCoord2f(1.0, 1.0); glVertex2f(start_x + i, start_y + i);
+		glTexCoord2f(0.0, 1.0); glVertex2f(start_x + 0, start_y + i);
+		glEnd();
+
+		start_x += i;
+	}
+}
+
+/**
+ * Returns whether the pixel at the coordinates matches the referenced color.
+ *
+ * Only the RGB channels are considered.
+ */
+static GLboolean
+probe_pixel(int x, int y, const GLfloat *color)
+{
+	GLfloat probe[4], delta[3];
+	GLfloat dmax = 0;
+	int i;
+
+	glReadPixels(x, y, 1, 1, GL_RGBA, GL_FLOAT, probe);
+	for (i = 0; i < 3; i++) {
+		delta[i] = probe[i] - color[i];
+
+		if (dmax < fabs(delta[i]))
+			dmax = fabs(delta[i]);
+	}
+
+	if (dmax > .02) {
+		printf("Expected at (%d,%d): %f,%f,%f\n",
+		       x, y, color[0], color[1], color[2]);
+		printf("Probed at   (%d,%d): %f,%f,%f\n",
+		       x, y, probe[0], probe[1], probe[2]);
+		return GL_FALSE;
+	}
+
+	return GL_TRUE;
+}
+
+static GLboolean check_resulting_mipmaps(int x, int y, const GLfloat *color)
+{
+	GLboolean pass = GL_TRUE;
+	int i;
+
+	for (i = 256; i > 4; i /= 2) {
+		pass = pass && probe_pixel(x + i / 2, y + i / 2, color);
+		x += i;
+	}
+
+	return pass;
+}
+
+static void display()
+{
+	GLfloat *data;
+	const GLfloat red[4] = {1.0, 0.0, 0.0, 0.0};
+	const GLfloat blue[4] = {0.0, 0.0, 1.0, 0.0};
+	GLint texture;
+	int i;
+
+	glClearColor(0, 0, 0, 0);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	/* Set up texture object with mipmap generation */
+	glGenTextures(1, &texture);
+	glBindTexture(GL_TEXTURE_2D, texture);
+
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
+			GL_LINEAR_MIPMAP_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
+
+	data = malloc(256 * 256 * 4 * sizeof(GLfloat));
+	for (i = 0; i < 4 * 256 * 256; i += 4) {
+		data[i + 0] = blue[0];
+		data[i + 1] = blue[1];
+		data[i + 2] = blue[2];
+		data[i + 3] = blue[3];
+	}
+
+	/* Initialize the texture to blue */
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 256, 256, 0,
+		     GL_RGBA, GL_FLOAT, data);
+
+	free(data);
+	/* Display the original mipmaps */
+	display_mipmaps(0, 0);
+
+	/* Update a square inside the texture to red */
+	data = malloc(128 * 128 * 4 * sizeof(GLfloat));
+	for (i = 0; i < 4 * 128 * 128; i += 4) {
+		data[i + 0] = red[0];
+		data[i + 1] = red[1];
+		data[i + 2] = red[2];
+		data[i + 3] = red[3];
+	}
+        glTexSubImage2D(GL_TEXTURE_2D, 0, 64, 64, 128, 128,
+			GL_RGBA, GL_FLOAT, data);
+	free(data);
+
+	/* Display the mipmaps after subimage */
+	display_mipmaps(0, 256);
+
+	glDeleteTextures(1, &texture);
+
+	glutSwapBuffers();
+	glFlush();
+
+	if (Automatic) {
+		int dim;
+		GLboolean pass = GL_TRUE;
+
+		pass = pass && check_resulting_mipmaps(0, 0, blue);
+		pass = pass && check_resulting_mipmaps(0, 256, red);
+
+		if (Automatic)
+			printf("PIGLIT: {'result': '%s' }\n",
+			       pass ? "pass" : "fail");
+		sleep(5);
+		exit(pass ? 0 : 1);
+	}
+}
+
+static void init()
+{
+	piglit_require_extension("GL_SGIS_generate_mipmap");
+
+	/* Set up projection matrix so we can just draw using window
+	 * coordinates.
+	 */
+	glMatrixMode(GL_PROJECTION);
+	glPushMatrix();
+	glLoadIdentity();
+	glOrtho(0, WIN_WIDTH, 0, WIN_HEIGHT, -1, 1);
+
+	glMatrixMode(GL_MODELVIEW);
+	glPushMatrix();
+	glLoadIdentity();
+
+	glEnable(GL_TEXTURE_2D);
+}
+
+int main(int argc, char**argv)
+{
+	int i;
+	glutInit(&argc, argv);
+	for(i = 1; i < argc; ++i) {
+		if (!strcmp(argv[i], "-auto"))
+			Automatic = 1;
+		else
+			printf("Unknown option: %s\n", argv[i]);
+	}
+	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
+	glutInitWindowSize(WIN_WIDTH, WIN_HEIGHT);
+	glutInitWindowPosition(100, 100);
+	glutCreateWindow("gen-texsubimage");
+	init();
+	glutDisplayFunc(display);
+	glutMainLoop();
+}