[Piglit] [PATCH] sampler-incomplete: test texture (in)completeness with sampler objects
Brian Paul
brianp at vmware.com
Wed Mar 21 16:03:50 PDT 2012
A texture can appear both complete and incomplete at the same time
depending on the sampler objects used to access it. This test checks
that behaviour.
---
tests/all.tests | 1 +
tests/spec/arb_sampler_objects/CMakeLists.gl.txt | 1 +
.../spec/arb_sampler_objects/sampler-incomplete.c | 142 ++++++++++++++++++++
3 files changed, 144 insertions(+), 0 deletions(-)
create mode 100644 tests/spec/arb_sampler_objects/sampler-incomplete.c
diff --git a/tests/all.tests b/tests/all.tests
index 1892889..d2ea3e9 100644
--- a/tests/all.tests
+++ b/tests/all.tests
@@ -1070,6 +1070,7 @@ add_concurrent_test(arb_framebuffer_object, 'same-attachment-glFramebufferRender
arb_sampler_objects = Group()
spec['ARB_sampler_objects'] = arb_sampler_objects
add_plain_test(arb_sampler_objects, 'sampler-objects')
+add_plain_test(arb_sampler_objects, 'sampler-incomplete')
# Group ARB_debug_output
arb_debug_output = Group()
diff --git a/tests/spec/arb_sampler_objects/CMakeLists.gl.txt b/tests/spec/arb_sampler_objects/CMakeLists.gl.txt
index 41804d5..20fd6f2 100644
--- a/tests/spec/arb_sampler_objects/CMakeLists.gl.txt
+++ b/tests/spec/arb_sampler_objects/CMakeLists.gl.txt
@@ -12,5 +12,6 @@ link_libraries (
)
add_executable (sampler-objects sampler-objects.c)
+add_executable (sampler-incomplete sampler-incomplete.c)
# vim: ft=cmake:
diff --git a/tests/spec/arb_sampler_objects/sampler-incomplete.c b/tests/spec/arb_sampler_objects/sampler-incomplete.c
new file mode 100644
index 0000000..4a66386
--- /dev/null
+++ b/tests/spec/arb_sampler_objects/sampler-incomplete.c
@@ -0,0 +1,142 @@
+/*
+ * Copyright (c) 2012 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 sampler-incomplete.c
+ *
+ * With GL_ARB_sampler_objects it's possible for a texture to be both complete
+ * and incomplete depending on the samplers used to access it.
+ * Test that we get the right results in this situation.
+ *
+ * Brian Paul
+ * March 2012
+ */
+
+
+#include "piglit-util.h"
+#include "piglit-framework.h"
+
+int piglit_width = 100;
+int piglit_height = 100;
+int piglit_window_mode = GLUT_DOUBLE | GLUT_RGB;
+
+
+static void
+setup(void)
+{
+ static const GLfloat red[2][2][4] = {
+ { {0.25, 0, 0, 0}, {0.25, 0, 0, 0} },
+ { {0.25, 0, 0, 0}, {0.25, 0, 0, 0} } };
+ static const char *fragShaderText =
+ "uniform sampler2D tex0, tex1;\n"
+ "void main()\n"
+ "{\n"
+ " vec2 coord = vec2(0.5, 0.5); \n"
+ " gl_FragColor = texture2D(tex0, coord) \n"
+ " + texture2D(tex1, coord);\n"
+ "}\n";
+ GLuint samplers[2];
+ GLuint frag, prog;
+ GLint u;
+ GLuint tex;
+
+ /* Create fragment shader that adds the two textures */
+ frag = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fragShaderText);
+ prog = piglit_link_simple_program(0, frag);
+
+ glUseProgram(prog);
+ u = glGetUniformLocation(prog, "tex0");
+ glUniform1i(u, 0);
+ u = glGetUniformLocation(prog, "tex1");
+ glUniform1i(u, 1);
+
+ /* create texture with one mipmap level */
+ glGenTextures(1, &tex);
+ glBindTexture(GL_TEXTURE_2D, tex);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 2, 2, 0,
+ GL_RGBA, GL_FLOAT, red);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+ /* bind the texture to units 0 and 1 */
+ glActiveTexture(GL_TEXTURE0);
+ glBindTexture(GL_TEXTURE_2D, tex);
+ glEnable(GL_TEXTURE_2D);
+
+ glActiveTexture(GL_TEXTURE1);
+ glBindTexture(GL_TEXTURE_2D, tex);
+ glEnable(GL_TEXTURE_2D);
+
+
+ glGenSamplers(2, samplers);
+
+ /* sampler[0] - nearest filtering, no mipmap.
+ * The result of sampling the texture should be (0.25, 0, 0, 0)
+ */
+ glBindSampler(0, samplers[0]);
+ glSamplerParameteri(samplers[0], GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+ glSamplerParameteri(samplers[0], GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+ /* sampler[1] - nearest filtering, with mipmapping.
+ * The result of sampling the texture should be (0, 0, 0, 1) since the
+ * texture is incomplete with respect to this sampler (no mipmap).
+ */
+ glBindSampler(1, samplers[1]);
+ glSamplerParameteri(samplers[1], GL_TEXTURE_MIN_FILTER,
+ GL_NEAREST_MIPMAP_NEAREST);
+ glSamplerParameteri(samplers[1], GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+}
+
+
+enum piglit_result
+piglit_display(void)
+{
+ /* NOTE: We're not checking the alpha value here.
+ * Some drivers (like NVIDIA) seem to return (0,0,0,0) when sampling
+ * an incomplete texture, but the spec says (0,0,0,1) should be
+ * returned. That's not really important for this test though so
+ * just ignore alpha.
+ */
+ GLfloat expected[3] = {0.25, 0, 0};
+ bool p;
+
+ glClear(GL_COLOR_BUFFER_BIT);
+
+ piglit_draw_rect_tex(-1, -1, 2, 2, 0, 0, 1, 1);
+
+ p = piglit_probe_pixel_rgb(piglit_width / 2, piglit_height / 2,
+ expected);
+
+ glutSwapBuffers();
+
+ return p ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+
+void
+piglit_init(int argc, char**argv)
+{
+ piglit_require_GLSL();
+ piglit_require_extension("GL_ARB_sampler_objects");
+ setup();
+}
--
1.7.3.4
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