provoking-vertex: New test for proper function of glProvokingVertexEXT.

Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 143 insertions, 0 deletions

diff --git a/tests/general/provoking-vertex.c b/tests/general/provoking-vertex.c
new file mode 100644
index 000000000..4455ee30a
--- /dev/null
+++ b/tests/general/provoking-vertex.c
@@ -0,0 +1,143 @@
+/*
+ * 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:
+ *    Ben Holmes <shranzel@hotmail.com>
+ */
+
+/*
+* draws two triangles using different colors for each vert(1st-red, 2nd-green,
+* 3rd-blue). first tri drawn using glProvokingVertexEXT set to
+* GL_FIRST_VERTEX_CONVENTION_EXT.
+* Second tri using GL_LAST_VERTEX_CONVENTION_EXT.
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <GL/glew.h>
+#if defined(__APPLE__)
+#include <GLUT/glut.h>
+#else
+#include <GL/glut.h>
+#endif
+#include "piglit-util.h"
+
+
+#ifndef APIENTRY
+#define APIENTRY
+#endif
+#ifndef APIENTRYP
+#define APIENTRYP APIENTRY *
+#endif
+#ifndef GL_EXT_provoking_vertex
+#define GL_EXT_provoking_vertex
+#define GL_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION_EXT 0x8E4C
+#define GL_FIRST_VERTEX_CONVENTION_EXT    0x8E4D
+#define GL_LAST_VERTEX_CONVENTION_EXT     0x8E4E
+#define GL_PROVOKING_VERTEX_EXT           0x8E4F
+typedef void (APIENTRYP PFNGLPROVOKINGVERTEXEXTPROC) (GLenum mode);
+#endif
+
+static PFNGLPROVOKINGVERTEXEXTPROC pglProvokingVertexEXT = 0;
+
+
+static GLboolean Automatic = GL_FALSE;
+
+static void
+Init()
+{
+
+	glewInit();
+	piglit_require_extension("GL_EXT_provoking_vertex");
+	pglProvokingVertexEXT = (PFNGLPROVOKINGVERTEXEXTPROC)
+		glutGetProcAddress("glProvokingVertexEXT");
+	glMatrixMode(GL_PROJECTION);
+	glPushMatrix();
+	glLoadIdentity();
+	glOrtho(0, 400, 0, 300, -1, 1);
+
+	glMatrixMode(GL_MODELVIEW);
+	glPushMatrix();
+	glLoadIdentity();
+
+	glShadeModel(GL_FLAT);
+
+	glClearColor(0.2, 0.2, 0.2, 1.0);
+
+}
+
+static void
+display()
+{
+	glClear(GL_COLOR_BUFFER_BIT);
+	pglProvokingVertexEXT(GL_FIRST_VERTEX_CONVENTION_EXT);
+	glBegin(GL_TRIANGLES);
+		glColor3f(1.0, 0.0, 0.0);
+		glVertex3i(125, 125, 0);
+		glColor3f(0.0, 1.0, 0.0);
+		glVertex3i(175, 125, 0);
+		glColor3f(0.0, 0.0, 1.0);
+		glVertex3i(150, 150, 0);
+	glEnd();
+
+	pglProvokingVertexEXT(GL_LAST_VERTEX_CONVENTION_EXT);
+	glBegin(GL_TRIANGLES);
+		glColor3f(1.0, 0.0, 0.0);
+		glVertex3i(200, 125, 0);
+		glColor3f(0.0, 1.0, 0.0);
+		glVertex3i(250, 125, 0);
+		glColor3f(0.0, 0.0, 1.0);
+		glVertex3i(225, 150, 0);
+	glEnd();
+
+	float red[3] = {1.0, 0.0, 0.0};
+	float blue[3] = {0.0, 0.0, 1.0};
+	GLboolean pass = GL_TRUE;
+	pass = pass && piglit_probe_pixel_rgb(150, 130, red);
+	pass = pass && piglit_probe_pixel_rgb(225, 130, blue);
+	if (Automatic)
+		piglit_report_result(pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE);
+
+	glFinish();
+	glutSwapBuffers();
+
+}
+
+int main(int argc, char **argv)
+{
+	glutInit(&argc, argv);
+	if (argc==2 && !strncmp(argv[1], "-auto", 5))
+		Automatic=GL_TRUE;
+	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
+	glutInitWindowSize(400, 300);
+	glutCreateWindow("provoking vertex");
+	glutDisplayFunc(display);
+	glutKeyboardFunc(piglit_escape_exit_key);
+
+	Init();
+
+	glutMainLoop();
+
+	return 0;
+
+}