[Piglit] [PATCH 2/2] getteximage-formats: test glGetTexImage() for many internal texture formats
Brian Paul
brianp at vmware.com
Wed Sep 28 13:13:15 PDT 2011
Basically, create a texture using one of the FBO internal formats with
auto-mipmap generation enabled. Then call glGetTexImage() for each mipmap
level and see if the results match what's expected.
---
tests/texturing/CMakeLists.gl.txt | 1 +
tests/texturing/getteximage-formats.c | 498 +++++++++++++++++++++++++++++++++
2 files changed, 499 insertions(+), 0 deletions(-)
create mode 100644 tests/texturing/getteximage-formats.c
diff --git a/tests/texturing/CMakeLists.gl.txt b/tests/texturing/CMakeLists.gl.txt
index 1ab3a9c..726af2d 100644
--- a/tests/texturing/CMakeLists.gl.txt
+++ b/tests/texturing/CMakeLists.gl.txt
@@ -26,6 +26,7 @@ add_executable (gen-compressed-teximage gen-compressed-teximage.c)
add_executable (gen-nonzero-unit gen-nonzero-unit.c)
add_executable (gen-teximage gen-teximage.c)
add_executable (gen-texsubimage gen-texsubimage.c)
+add_executable (getteximage-formats getteximage-formats.c)
add_executable (getteximage-simple getteximage-simple.c)
add_executable (fragment-and-vertex-texturing fragment-and-vertex-texturing.c)
add_executable (levelclamp levelclamp.c)
diff --git a/tests/texturing/getteximage-formats.c b/tests/texturing/getteximage-formats.c
new file mode 100644
index 0000000..95df79d
--- /dev/null
+++ b/tests/texturing/getteximage-formats.c
@@ -0,0 +1,498 @@
+/*
+ * Copyright (c) 2011 VMware, Inc.
+ *
+ * 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
+ * on the rights to use, copy, modify, merge, publish, distribute, sub
+ * license, 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
+ * NON-INFRINGEMENT. IN NO EVENT SHALL VMWARE AND/OR THEIR SUPPLIERS
+ * 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.
+ */
+
+
+/**
+ * @file getteximage-formats.c
+ *
+ * Test glGetTexImage with a variety of formats.
+ * Brian Paul
+ * Sep 2011
+ */
+
+
+#include "piglit-util.h"
+#include "../fbo/fbo-formats.h"
+
+int piglit_width = 600, piglit_height = 200;
+int piglit_window_mode = GLUT_RGBA | GLUT_ALPHA | GLUT_DOUBLE;
+
+static const char *TestName = "getteximage-formats";
+
+static const GLfloat clearColor[4] = { 0.2, 0.2, 0.2, 0.0 };
+
+#define TEX_WIDTH 128
+#define TEX_HEIGHT 128
+
+
+
+/**
+ * Is the given format a depth (stencil) format?
+ * XXX we don't test those formats yet.
+ */
+static GLboolean
+is_depth_format(GLenum intFormat)
+{
+ switch (intFormat) {
+ case GL_DEPTH_COMPONENT16:
+ case GL_DEPTH_COMPONENT24:
+ case GL_DEPTH_COMPONENT32:
+ case GL_DEPTH_COMPONENT:
+ case GL_DEPTH_STENCIL:
+ case GL_DEPTH24_STENCIL8:
+ return GL_TRUE;
+ default:
+ return GL_FALSE;
+ }
+}
+
+
+/**
+ * Make a simple texture image where red increases from left to right,
+ * green increases from bottom to top, blue stays constant (50%) and
+ * the alpha channel is a checkerboard pattern.
+ * \return GL_TRUE for success, GL_FALSE if unsupported format
+ */
+static GLboolean
+make_texture_image(GLenum intFormat, GLubyte upperRightTexel[4])
+{
+ GLubyte tex[TEX_HEIGHT][TEX_WIDTH][4];
+ int i, j;
+
+ for (i = 0; i < TEX_HEIGHT; i++) {
+ for (j = 0; j < TEX_WIDTH; j++) {
+ tex[i][j][0] = j * 255 / TEX_WIDTH;
+ tex[i][j][1] = i * 255 / TEX_HEIGHT;
+ tex[i][j][2] = 128;
+ if (((i >> 4) ^ (j >> 4)) & 1)
+ tex[i][j][3] = 255; /* opaque */
+ else
+ tex[i][j][3] = 125; /* transparent */
+ }
+ }
+
+ memcpy(upperRightTexel, tex[TEX_HEIGHT-1][TEX_WIDTH-1], 4);
+
+ glTexImage2D(GL_TEXTURE_2D, 0, intFormat, TEX_WIDTH, TEX_HEIGHT, 0,
+ GL_RGBA, GL_UNSIGNED_BYTE, tex);
+
+ return glGetError() == GL_NO_ERROR;
+}
+
+
+static void
+print(int x, int y, const char *s)
+{
+ glColor3f(1, 1, 1);
+ glWindowPos2i(x, y);
+ while (*s) {
+ glutBitmapCharacter(GLUT_BITMAP_8_BY_13, (int) *s);
+ s++;
+ }
+}
+
+
+static GLfloat
+ubyte_to_float(GLubyte b, GLint bits)
+{
+ if (bits <= 8) {
+ GLint b2 = b >> (8 - bits);
+ GLint max = 255 >> (8 - bits);
+ return b2 / (float) max;
+ }
+ else {
+ return b / 255.0;
+ }
+}
+
+
+
+static GLfloat
+bits_to_tolerance(GLint bits, GLboolean compressed)
+{
+ GLfloat t;
+
+ if (bits == 0) {
+ return 0.25;
+ }
+ else if (bits == 1) {
+ return 0.5;
+ }
+ else if (bits > 8) {
+ /* The original texture was specified as GLubyte and we
+ * assume that the window/surface is 8-bits/channel.
+ */
+ t = 4.0 / 255;
+ }
+ else {
+ t = 4.0 / (1 << (bits - 1));
+ }
+ if (compressed) {
+ t *= 4.0;
+ t = 0.5;
+ }
+ return t;
+}
+
+
+static void
+compute_expected_color(const struct format_desc *fmt,
+ const GLubyte upperRightTexel[4],
+ GLfloat expected[4], GLfloat tolerance[4])
+{
+ GLint r, g, b, a, l, i, compressed;
+ GLenum baseFormat;
+ GLfloat texel[4];
+ int bits[4];
+
+ baseFormat = 0;
+ bits[0] = bits[1] = bits[2] = bits[3] = 0;
+
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_RED_SIZE, &r);
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_GREEN_SIZE, &g);
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_BLUE_SIZE, &b);
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_ALPHA_SIZE, &a);
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_LUMINANCE_SIZE, &l);
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_INTENSITY_SIZE, &i);
+ glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_COMPRESSED, &compressed);
+
+ if (0)
+ printf("r=%d g=%d b=%d a=%d l=%d i=%d\n", r, g, b, a, l, i);
+
+ if (i > 0) {
+ baseFormat = GL_INTENSITY;
+ bits[0] = i;
+ bits[1] = 0;
+ bits[2] = 0;
+ bits[3] = i;
+ texel[0] = ubyte_to_float(upperRightTexel[0], bits[0]);
+ texel[1] = 0.0;
+ texel[2] = 0.0;
+ texel[3] = ubyte_to_float(upperRightTexel[0], bits[3]);
+ }
+ else if (a > 0) {
+ if (l > 0) {
+ baseFormat = GL_LUMINANCE_ALPHA;
+ bits[0] = l;
+ bits[1] = 0;
+ bits[2] = 0;
+ bits[3] = a;
+ texel[0] = ubyte_to_float(upperRightTexel[0], bits[0]);
+ texel[1] = 0.0;
+ texel[2] = 0.0;
+ texel[3] = ubyte_to_float(upperRightTexel[3], bits[3]);
+ }
+ else if (r > 0 && g > 0 && b > 0) {
+ baseFormat = GL_RGBA;
+ bits[0] = r;
+ bits[1] = g;
+ bits[2] = b;
+ bits[3] = a;
+ texel[0] = ubyte_to_float(upperRightTexel[0], bits[0]);
+ texel[1] = ubyte_to_float(upperRightTexel[1], bits[1]);
+ texel[2] = ubyte_to_float(upperRightTexel[2], bits[2]);
+ texel[3] = ubyte_to_float(upperRightTexel[3], bits[3]);
+ }
+ else if (r == 0 && g == 0 && b == 0) {
+ baseFormat = GL_ALPHA;
+ bits[0] = 0;
+ bits[1] = 0;
+ bits[2] = 0;
+ bits[3] = a;
+ texel[0] = 0.0;
+ texel[1] = 0.0;
+ texel[2] = 0.0;
+ texel[3] = ubyte_to_float(upperRightTexel[3], bits[3]);
+ }
+ else {
+ baseFormat = 0; /* ??? */
+ }
+ }
+ else if (l > 0) {
+ baseFormat = GL_LUMINANCE;
+ bits[0] = l;
+ bits[1] = 0;
+ bits[2] = 0;
+ bits[3] = 0;
+ texel[0] = ubyte_to_float(upperRightTexel[0], bits[0]);
+ texel[1] = 0.0;
+ texel[2] = 0.0;
+ texel[3] = 1.0;
+ }
+ else if (r > 0) {
+ if (g > 0) {
+ if (b > 0) {
+ baseFormat = GL_RGB;
+ bits[0] = r;
+ bits[1] = g;
+ bits[2] = b;
+ bits[3] = 0;
+ texel[0] = ubyte_to_float(upperRightTexel[0], bits[0]);
+ texel[1] = ubyte_to_float(upperRightTexel[1], bits[1]);
+ texel[2] = ubyte_to_float(upperRightTexel[2], bits[2]);
+ texel[3] = 1.0;
+ }
+ else {
+ baseFormat = GL_RG;
+ bits[0] = r;
+ bits[1] = g;
+ bits[2] = 0;
+ bits[3] = 0;
+ texel[0] = ubyte_to_float(upperRightTexel[0], bits[0]);
+ texel[1] = ubyte_to_float(upperRightTexel[1], bits[1]);
+ texel[2] = 0.0;
+ texel[3] = 1.0;
+ }
+ }
+ else {
+ baseFormat = GL_RED;
+ bits[0] = r;
+ bits[1] = 0;
+ bits[2] = 0;
+ bits[3] = 0;
+ texel[0] = ubyte_to_float(upperRightTexel[0], bits[0]);
+ texel[1] = 0.0;
+ texel[2] = 0.0;
+ texel[3] = 1.0;
+ }
+ }
+ else {
+ /* ??? */
+ }
+
+ /* compute texel color blended with background color */
+ expected[0] = texel[0] * texel[3] + clearColor[0] * (1.0 - texel[3]);
+ expected[1] = texel[1] * texel[3] + clearColor[1] * (1.0 - texel[3]);
+ expected[2] = texel[2] * texel[3] + clearColor[2] * (1.0 - texel[3]);
+ expected[3] = texel[3] * texel[3] + clearColor[3] * (1.0 - texel[3]);
+
+ assert(expected[0] == expected[0]);
+
+ tolerance[0] = bits_to_tolerance(bits[0], compressed);
+ tolerance[1] = bits_to_tolerance(bits[1], compressed);
+ tolerance[2] = bits_to_tolerance(bits[2], compressed);
+ tolerance[3] = bits_to_tolerance(bits[3], compressed);
+}
+
+
+static GLboolean
+colors_equal(const GLfloat expected[4], const GLfloat pix[4],
+ GLfloat tolerance[4])
+{
+ if (fabsf(expected[0] - pix[0]) > tolerance[0] ||
+ fabsf(expected[1] - pix[1]) > tolerance[1] ||
+ fabsf(expected[2] - pix[2]) > tolerance[2] ||
+ fabsf(expected[3] - pix[3]) > tolerance[3]) {
+ return GL_FALSE;
+ }
+ return GL_TRUE;
+}
+
+
+
+static GLboolean
+test_format(const struct test_desc *test,
+ const struct format_desc *fmt)
+{
+ int x, y;
+ int w = TEX_WIDTH, h = TEX_HEIGHT;
+ GLfloat readback[TEX_HEIGHT][TEX_WIDTH][4];
+ GLubyte upperRightTexel[4];
+ int level;
+ GLfloat expected[4], pix[4], tolerance[4];
+
+ glClearColor(clearColor[0],
+ clearColor[1],
+ clearColor[2],
+ clearColor[3]);
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ if (!piglit_automatic) {
+ char s[200];
+ sprintf(s, "%s: %s", test->param, fmt->name);
+ print(10, piglit_height - 20, s);
+ }
+
+ if (is_depth_format(fmt->internalformat)) {
+ print(10, piglit_height - 40, "Not supported by test");
+ }
+ else {
+ /* init texture image */
+ if (!make_texture_image(fmt->internalformat, upperRightTexel))
+ return GL_TRUE; /* unsupported = OK */
+
+ x = 10;
+ y = 40;
+
+ compute_expected_color(fmt, upperRightTexel, expected, tolerance);
+
+ /* Draw with the texture */
+ glEnable(GL_TEXTURE_2D);
+ glEnable(GL_BLEND);
+ piglit_draw_rect_tex(x, y, w, h, 0.0, 0.0, 1.0, 1.0);
+ glDisable(GL_TEXTURE_2D);
+ glDisable(GL_BLEND);
+
+ assert(!glIsEnabled(GL_TEXTURE_2D));
+ if (!piglit_automatic)
+ print(x, y - 18, "Textured Quad");
+
+ x += TEX_WIDTH + 20;
+
+ level = 0;
+ while (w > 0) {
+ /* Get the texture image */
+ assert(!glIsEnabled(GL_TEXTURE_2D));
+ glGetTexImage(GL_TEXTURE_2D, level, GL_RGBA, GL_FLOAT, readback);
+
+ assert(!glIsEnabled(GL_TEXTURE_2D));
+ /* Draw the texture image */
+ glWindowPos2i(x, y);
+ glEnable(GL_BLEND);
+ assert(!glIsEnabled(GL_TEXTURE_2D));
+ glDrawPixels(w, h, GL_RGBA, GL_FLOAT, readback);
+ glDisable(GL_BLEND);
+
+ assert(!glIsEnabled(GL_TEXTURE_2D));
+ if (!piglit_automatic) {
+ if (level == 0) {
+ /*
+ print(x, y - 18, "glDrawPixels of");
+ print(x, y - 30, " glGetTexImage");
+ */
+ print(x, y - 18, "glGetTexImage");
+ print(x, y - 30, "level 0");
+ }
+ else {
+ char s[10];
+ sprintf(s, "%d", level);
+ print(x, y - 18, s);
+ }
+ }
+
+ if (level <= 2) {
+ GLint rx = x + w-1;
+ GLint ry = y + h-1;
+ glReadPixels(rx, ry, 1, 1, GL_RGBA, GL_FLOAT, pix);
+ if (!colors_equal(expected, pix, tolerance)) {
+ printf("%s failure: format: %s, level %d at pixel(%d, %d)\n",
+ TestName, fmt->name, level, rx, ry);
+ printf(" Expected (%f, %f, %f, %f)\n",
+ expected[0], expected[1], expected[2], expected[3]);
+ printf(" Found (%f, %f, %f, %f)\n",
+ pix[0], pix[1], pix[2], pix[3]);
+ printf("Tolerance (%f, %f, %f, %f)\n",
+ tolerance[0], tolerance[1], tolerance[2], tolerance[3]);
+ }
+ }
+
+ x += w + 20;
+ w /= 2;
+ h /= 2;
+ level++;
+ }
+
+ }
+
+ glutSwapBuffers();
+
+ return GL_TRUE;
+}
+
+
+static GLboolean
+test_formats(void)
+{
+ GLboolean pass = GL_TRUE;
+ int i, j;
+
+ for (i = 0; i < ARRAY_SIZE(test_sets); i++) {
+ for (j = 0; j < test_sets[i].num_formats; j++) {
+ if (!test_format(&test_sets[i],
+ &test_sets[i].format[j])) {
+ pass = GL_FALSE;
+ }
+ }
+ }
+
+ return pass;
+}
+
+
+enum piglit_result
+piglit_display(void)
+{
+ GLboolean pass;
+
+ if (piglit_automatic) {
+ pass = test_formats();
+ }
+ else {
+ pass = test_format(&test_sets[test_index],
+ &test_sets[test_index].format[format_index]);
+ }
+
+ return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+
+static void
+reshape(int width, int height)
+{
+ piglit_width = width;
+ piglit_height = height;
+ glViewport(0, 0, width, height);
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glOrtho(0, piglit_width, 0, piglit_height, -1.0, 1.0);
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+}
+
+
+void
+piglit_init(int argc, char **argv)
+{
+ GLuint t;
+
+ /* XXX we're assuming GL 1.4 or later (for GL_GENERATE_MIPMAP) */
+
+ fbo_formats_init(argc, argv, 0);
+ (void) fbo_formats_display;
+
+ glutReshapeFunc(reshape);
+ /*glutKeyboardFunc(key);*/
+
+ reshape(piglit_width, piglit_height);
+
+ glGenTextures(1, &t);
+ glBindTexture(GL_TEXTURE_2D, t);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
+
+ glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+
+ glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+}
--
1.7.3.4
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