glsl-fs-fragcoord: New test for basic functionality of gl_FragCoord.

tests/all.tests

@@ -102,6 +102,7 @@ shaders['glsl-bug-22603'] = PlainExecTest([testBinDir + 'glsl-bug-22603', '-auto
 shaders['glsl-uniform-update'] = PlainExecTest([testBinDir + 'glsl-uniform-update', '-auto'])
 shaders['glsl-unused-varying'] = PlainExecTest([testBinDir + 'glsl-unused-varying', '-auto'])
 shaders['glsl-fs-exp2'] = PlainExecTest([testBinDir + 'glsl-fs-exp2', '-auto'])
+shaders['glsl-fs-fragcoord'] = PlainExecTest([testBinDir + 'glsl-fs-fragcoord', '-auto'])
 shaders['glsl-fs-log2'] = PlainExecTest([testBinDir + 'glsl-fs-log2', '-auto'])
 shaders['glsl-vs-if'] = PlainExecTest([testBinDir + 'glsl-vs-if', '-auto'])
 shaders['glsl-vs-if-bool'] = PlainExecTest([testBinDir + 'glsl-vs-if-bool', '-auto'])

tests/shaders/CMakeLists.txt

@@ -35,6 +35,7 @@ add_executable (glsl-bug-22603 glsl-bug-22603.c)
 add_executable (glsl-unused-varying glsl-unused-varying.c)
 add_executable (glsl-uniform-update glsl-uniform-update.c)
 add_executable (glsl-fs-exp2 glsl-fs-exp2.c)
+add_executable (glsl-fs-fragcoord glsl-fs-fragcoord.c)
 add_executable (glsl-fs-log2 glsl-fs-log2.c)
 add_executable (glsl-vs-if glsl-vs-if.c)
 add_executable (glsl-vs-if-bool glsl-vs-if-bool.c)

tests/shaders/glsl-fs-fragcoord.c

+/*
+ * Copyright © 2009 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:
+ *    Eric Anholt <eric@anholt.net>
+ *
+ */
+
+/** @file glsl-fs-fragcoord.c
+ *
+ * Tests that gl_FragCoord produces the expected output in a fragment shader.
+ */
+
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/stat.h>
+#define GL_GLEXT_PROTOTYPES
+#include <GL/glew.h>
+#if defined(__APPLE__)
+#include <GLUT/glut.h>
+#else
+#include "GL/glut.h"
+#endif
+
+#include "piglit-util.h"
+
+#define WIN_WIDTH 256
+#define WIN_HEIGHT 256
+
+static GLint prog;
+static GLboolean Automatic;
+
+static void
+display(void)
+{
+	GLboolean pass = GL_TRUE;
+	int x, y;
+
+	glClearColor(0.5, 0.5, 0.5, 0.5);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	piglit_draw_rect(0, 0, WIN_WIDTH, WIN_HEIGHT);
+
+	for (y = 0; y < WIN_HEIGHT; y++) {
+		for (x = 0; x < WIN_WIDTH; x++) {
+			float color[3];
+
+			color[0] = x / 256.0;
+			color[1] = y / 256.0;
+			color[2] = 0;
+
+			pass &= piglit_probe_pixel_rgb(x, y, color);
+			if (!pass)
+				break;
+		}
+	}
+
+	glutSwapBuffers();
+
+	if (Automatic)
+		piglit_report_result(pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE);
+}
+
+static void init()
+{
+	GLint vs, fs;
+
+	/* 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();
+
+	vs = piglit_compile_shader(GL_VERTEX_SHADER,
+				   SOURCE_DIR "tests/shaders/glsl-fs-fragcoord.vert");
+	fs = piglit_compile_shader(GL_FRAGMENT_SHADER,
+				   SOURCE_DIR "tests/shaders/glsl-fs-fragcoord.frag");
+
+	prog = piglit_link_simple_program(vs, fs);
+
+	glUseProgram(prog);
+}
+
+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);
+	glutCreateWindow("glsl-fs-fragcoord");
+	glutKeyboardFunc(piglit_escape_exit_key);
+	glutDisplayFunc(display);
+	glewInit();
+
+	if (!GLEW_VERSION_2_0) {
+		printf("Requires OpenGL 2.0\n");
+		piglit_report_result(PIGLIT_SKIP);
+		exit(1);
+	}
+	init();
+
+	glutMainLoop();
+
+	return 0;
+}

tests/shaders/glsl-fs-fragcoord.frag

+void main()
+{
+	gl_FragColor = vec4(gl_FragCoord / 256, 0, 0);
+}

tests/shaders/glsl-fs-fragcoord.vert

+void main()
+{
+	gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
+}
+