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/*
* Copyright © 2014 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
* 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.
*/
/**
* \file fbo-tex-rgbx.c
* \author Brian Paul
*
* Test texturing from an RGB texture after we've rendered some
* non-1 alpha values into it. When we sample from an RGB texture,
* the alpha values should always be one.
* Many (most?) GL implementations store RGB textures as RGBx so there
* really is an alpha channel but it's supposed to be ignored when we
* sample from it.
*/
#include "piglit-util-gl-common.h"
#define TEX_SIZE 256
PIGLIT_GL_TEST_CONFIG_BEGIN
config.window_width = TEX_SIZE;
config.window_height = TEX_SIZE;
config.supports_gl_compat_version = 10;
config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
PIGLIT_GL_TEST_CONFIG_END
static const char *fragShaderText =
"uniform sampler2D tex; \n"
"void main() \n"
"{ \n"
" gl_FragColor = texture2D(tex, gl_TexCoord[0].xy); \n"
"} \n";
static GLuint Program;
/* draw green quad with varying alpha values */
static void
draw_quad(void)
{
static const float verts[4][2] = {
{ -1.0f, -1.0f },
{ 1.0f, -1.0f },
{ 1.0f, 1.0f },
{ -1.0f, 1.0f }
};
static const float colors[4][4] = {
{ 0.0f, 1.0f, 0.0f, 0.1f },
{ 0.0f, 1.0f, 0.0f, 0.2f },
{ 0.0f, 1.0f, 0.0f, 0.8f },
{ 0.0f, 1.0f, 0.0f, 0.9f }
};
glVertexPointer(2, GL_FLOAT, 0, verts);
glColorPointer(4, GL_FLOAT, 0, colors);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
}
/**
* Create texture with given internal format. Render to it. Then draw
* a test quad using that texture. Check that all alpha values are one.
*/
static bool
test_format(GLenum internalFormat)
{
GLuint tex, fbo;
GLenum status;
bool pass = true;
GLubyte *results;
GLuint i;
/* Create (RGB) tex and FBO to render into it */
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, TEX_SIZE, TEX_SIZE, 0,
GL_RGB, GL_UNSIGNED_BYTE, NULL);
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glFramebufferTexture2D(GL_FRAMEBUFFER,
GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D, tex, 0);
if (!piglit_check_gl_error(GL_NO_ERROR))
return false;
status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if (status != GL_FRAMEBUFFER_COMPLETE) {
fprintf(stderr, "incomplete fbo (status 0x%x)\n", status);
return true; /* this isn't necessarily a failure */
}
/* Draw into tex, constant green and varying alpha */
glUseProgram(0);
draw_quad();
/* Now draw a textured quad in the window using the texture that we
* just rendered to.
*/
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glUseProgram(Program);
piglit_draw_rect_tex(-1.0f, -1.0f, 2.0f, 2.0f,
0.0f, 0.0f, 1.0f, 1.0f);
/* Now read back the rendering and check that alpha is always one */
results = malloc(TEX_SIZE * TEX_SIZE * 4);
glReadPixels(0, 0, TEX_SIZE, TEX_SIZE,
GL_RGBA, GL_UNSIGNED_BYTE, results);
for (i = 0; i < TEX_SIZE * TEX_SIZE; i++) {
if (results[i*4+3] != 255) {
fprintf(stderr,
"Bad alpha value at texel [%d]: %d."
" Should be 255."
" Texture format %s\n",
i, results[i*4+3],
piglit_get_gl_enum_name(internalFormat));
pass = false;
break;
}
}
free(results);
piglit_present_results();
glDeleteFramebuffers(1, &fbo);
glDeleteTextures(1, &tex);
return pass;
}
void
piglit_init(int argc, char **argv)
{
piglit_require_extension("GL_ARB_framebuffer_object");
piglit_require_gl_version(20);
Program = piglit_build_simple_program(NULL, fragShaderText);
assert(Program);
}
enum piglit_result
piglit_display(void)
{
bool pass = true;
pass = test_format(GL_RGB) && pass;
pass = test_format(GL_RGB4) && pass;
pass = test_format(GL_RGB5) && pass;
pass = test_format(GL_RGB8) && pass;
pass = test_format(GL_RGB10) && pass;
pass = test_format(GL_RGB12) && pass;
pass = test_format(GL_RGB16) && pass;
if (piglit_is_extension_supported("GL_ARB_ES2_compatibility")) {
pass = test_format(GL_RGB565) && pass;
}
if (piglit_is_extension_supported("GL_EXT_texture_sRGB")) {
pass = test_format(GL_SRGB) && pass;
pass = test_format(GL_SRGB8) && pass;
}
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
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