lodclamp: New test to verify the behavior of GL_TEXTURE_MIN/MAX_LOD.

3 files changed, 200 insertions, 0 deletions

diff --git a/tests/all.tests b/tests/all.tests
index 11b5e8204..95d743195 100644
--- a/tests/all.tests
+++ b/tests/all.tests
@@ -197,6 +197,7 @@ add_plain_test(texturing, 'gen-compressed-teximage')
 add_plain_test(texturing, 'gen-texsubimage')
 add_plain_test(texturing, 'getteximage-simple')
 add_plain_test(texturing, 'lodbias')
+add_plain_test(texturing, 'lodclamp')
 add_plain_test(texturing, 's3tc-teximage')
 add_plain_test(texturing, 's3tc-texsubimage')
 add_plain_test(texturing, 'streaming-texture-leak')
diff --git a/tests/texturing/CMakeLists.txt b/tests/texturing/CMakeLists.txt
index 890b291b8..d34aeb8ce 100644
--- a/tests/texturing/CMakeLists.txt
+++ b/tests/texturing/CMakeLists.txt
@@ -26,6 +26,7 @@ add_executable (gen-teximage gen-teximage.c)
 add_executable (gen-texsubimage gen-texsubimage.c)
 add_executable (getteximage-simple getteximage-simple.c)
 add_executable (lodbias lodbias.c)
+add_executable (lodclamp lodclamp.c)
 add_executable (s3tc-teximage s3tc-teximage.c)
 add_executable (s3tc-texsubimage s3tc-texsubimage.c)
 add_executable (streaming-texture-leak streaming-texture-leak.c)
diff --git a/tests/texturing/lodclamp.c b/tests/texturing/lodclamp.c
new file mode 100644
index 000000000..8e2f6a3e8
--- /dev/null
+++ b/tests/texturing/lodclamp.c
@@ -0,0 +1,198 @@
+/*
+ * Copyright © 2008-2009 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>
+ *
+ */
+
+/**
+ * Tests that all the appropriate integer values of GL_TEXTURE_MIN_LOD and
+ * GL_TEXTURE_MAX_LOD work on a mipmapped 2D texture.
+ */
+
+#include "piglit-util.h"
+
+#define MAX_SIZE	32
+#define MAX_LOD	5
+#define PAD		5
+
+int piglit_window_mode = GLUT_DOUBLE | GLUT_RGB;
+int piglit_width = 500;
+int piglit_height = 600;
+
+static GLfloat colors[][3] = {
+	{1.0, 0.0, 0.0},
+	{0.0, 1.0, 0.0},
+	{0.0, 0.0, 1.0},
+	{1.0, 1.0, 0.0},
+	{1.0, 0.0, 1.0},
+	{0.0, 1.0, 1.0},
+};
+
+static void
+set_level_color(int level, int size, int color)
+{
+	GLfloat *tex;
+	int x, y;
+
+	tex = malloc(size * size * 3 * sizeof(GLfloat));
+
+	for (y = 0; y < size; y++) {
+		for (x = 0; x < size; x++) {
+			tex[(y * size + x) * 3 + 0] = colors[color][0];
+			tex[(y * size + x) * 3 + 1] = colors[color][1];
+			tex[(y * size + x) * 3 + 2] = colors[color][2];
+		}
+	}
+
+	glTexImage2D(GL_TEXTURE_2D, level, GL_RGB,
+		     size, size, 0,
+		     GL_RGB, GL_FLOAT, tex);
+
+	free(tex);
+}
+
+/**
+ * Tests that the mipmap drawn at (x,y)-(x+size,y+size) has the majority color,
+ * with color+1 in bottom left.
+ */
+static GLboolean
+test_results(int x, int y, int size, int level, int min_lod, int max_lod)
+{
+	GLboolean pass = GL_TRUE;
+	int x1 = x + size / 4, x2 = x + size * 3 / 4;
+	int y1 = y + size / 4, y2 = y + size * 3 / 4;
+	int clamped_lod;
+
+	clamped_lod = level;
+	if (clamped_lod > max_lod)
+		clamped_lod = max_lod;
+	if (clamped_lod < min_lod)
+		clamped_lod = min_lod;
+
+	if (size == 1) {
+		pass = pass && piglit_probe_pixel_rgb(x1, y1, colors[clamped_lod]);
+	} else {
+		pass = pass && piglit_probe_pixel_rgb(x1, y1, colors[clamped_lod]);
+		pass = pass && piglit_probe_pixel_rgb(x2, y1, colors[clamped_lod]);
+		pass = pass && piglit_probe_pixel_rgb(x2, y2, colors[clamped_lod]);
+		pass = pass && piglit_probe_pixel_rgb(x1, y2, colors[clamped_lod]);
+	}
+
+	if (!pass) {
+		printf("failed at level %d (%dx%d) with LOD clamped to "
+		       "(%d,%d)\n",
+		       level, size, size, min_lod, max_lod);
+	}
+
+	return pass;
+}
+
+static GLboolean
+draw_and_test(int x_offset, int y_offset, float min_lod, float max_lod)
+{
+	GLfloat y;
+	int dim;
+	int level, lod;
+	GLboolean pass = GL_TRUE;
+
+	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, max_lod);
+	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_LOD, min_lod);
+
+	y = y_offset;
+	for (level = 0, dim = MAX_SIZE; dim > 0; level++, dim /= 2) {
+		piglit_draw_rect_tex(x_offset, y, dim, dim,
+				     0.0, 0.0, 1.0, 1.0);
+
+		y += dim + PAD;
+	}
+
+	y = y_offset;
+	for (level = 0, dim = MAX_SIZE; dim > 0; level++, dim /= 2) {
+		pass = pass && test_results(x_offset, y,
+					    dim, level,
+					    min_lod, max_lod) && pass;
+
+		y += dim + PAD;
+		lod--;
+	}
+
+	return pass;
+}
+
+
+enum piglit_result
+piglit_display(void)
+{
+	int dim;
+	GLboolean pass = GL_TRUE;
+	int level, min_lod, max_lod, x_offset, y_offset;
+	GLuint tex;
+
+	piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
+
+	/* Clear background to gray */
+	glClearColor(0.5, 0.5, 0.5, 1.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	/* Create the texture. */
+	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);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+	/* Fill in each level */
+	for (level = 0, dim = MAX_SIZE; dim > 0; level++, dim /= 2) {
+		set_level_color(level, dim, level);
+	}
+
+	/* Draw all the levels with varying clamp ranges. */
+	glEnable(GL_TEXTURE_2D);
+	y_offset = 10;
+	for (min_lod = 0; min_lod <= MAX_LOD; min_lod++) {
+		x_offset = 10;
+
+		for (max_lod = MAX_LOD; max_lod >= min_lod; max_lod--) {
+			pass = draw_and_test(x_offset, y_offset,
+					     min_lod, max_lod) && pass;
+			x_offset += MAX_SIZE + PAD;
+		}
+
+		y_offset += (MAX_SIZE * 2 + PAD * 7);
+	}
+
+	glDeleteTextures(1, &tex);
+
+	glutSwapBuffers();
+
+	return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+}