New test: texturing/texdepth

Very basic test of
 - ARB_depth_texture
 - ARB_shadow
 - ARB_shadow_ambient
 - EXT_shadow_funcs

tests/all.tests

@@ -70,6 +70,7 @@ bugs['r300-readcache'] = PlainExecTest([testBinDir + 'r300-readcache'])
 
 texturing = Group()
 texturing['cubemap'] = PlainExecTest([testBinDir + 'cubemap', '-auto'])
+texturing['texdepth'] = PlainExecTest([testBinDir + 'texdepth', '-auto'])
 texturing['texrect-many'] = PlainExecTest([testBinDir + 'texrect-many', '-auto'])
 
 profile.tests['bugs'] = bugs

tests/texturing/CMakeLists.txt

@@ -19,4 +19,5 @@ link_libraries (
 )
 
 add_executable (cubemap cubemap.c)
+add_executable (texdepth texdepth.c)
 add_executable (texrect-many texrect-many.c)

tests/util/piglit-util.c

@@ -23,6 +23,10 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <math.h>
+
+#include "GL/glut.h"
+
 #include "piglit-util.h"
 
 /** Returns the line in the program string given the character position. */
@@ -59,3 +63,36 @@ void piglit_require_extension(const char *name)
 		exit(1);
 	}
 }
+
+/**
+ * Read a pixel from the given location and compare its RGBA value to the
+ * given expected values.
+ *
+ * Print a log message if the color value deviates from the expected value.
+ * \return true if the color values match, false otherwise
+ */
+int piglit_probe_pixel_rgba(int x, int y, const float* expected)
+{
+	GLfloat probe[4];
+	GLfloat delta[4];
+	GLfloat deltamax;
+	int i;
+
+	glReadPixels(x, y, 1, 1, GL_RGBA, GL_FLOAT, probe);
+
+	deltamax = 0.0;
+	for(i = 0; i < 4; ++i) {
+		delta[i] = probe[i] - expected[i];
+		if (fabs(delta[i]) > deltamax)
+			deltamax = fabs(delta[i]);
+	}
+
+	if (deltamax < 0.01)
+		return 1;
+
+	printf("Probe at (%i,%i)\n", x, y);
+	printf("  Expected: %f %f %f %f\n", expected[0], expected[1], expected[2], expected[3]);
+	printf("  Observed: %f %f %f %f\n", probe[0], probe[1], probe[2], probe[3]);
+
+	return 0;
+}

tests/util/piglit-util.h

@@ -32,4 +32,4 @@ enum piglit_result {
 int FindLine(const char *program, int position);
 void piglit_report_result(enum piglit_result result);
 void piglit_require_extension(const char *name);
-
+int piglit_probe_pixel_rgba(int x, int y, const float* expected);