Test sampling functions with constant zero arguments

Tests various texture sampling functions using constant 0 values for
the arguments. The i965 driver has optimisations for trailing 0
arguments to sampler messages so the intention is to test these code
paths.

3 files changed, 267 insertions, 0 deletions

diff --git a/tests/all.py b/tests/all.py
index b85d2a21d..c92289a4a 100644
--- a/tests/all.py
+++ b/tests/all.py
@@ -644,6 +644,16 @@ with profile.group_manager(PiglitGLTest, 'shaders') as g:
     for subtest in ('interstage', 'intrastage', 'vs-gs'):
         g(['version-mixing', subtest])
 
+    for subtest in ('texture2D',
+                    'bias',
+                    'textureGrad',
+                    'texelFetch',
+                    'textureLod',
+                    'textureSize',
+                    'textureQueryLOD',
+                    'textureGather'):
+        g(['zero-tex-coord', subtest])
+
 with profile.group_manager(
         PiglitGLTest, 'glx',
         require_platforms=['glx', 'mixed_glx_egl']) as g:
diff --git a/tests/texturing/CMakeLists.gl.txt b/tests/texturing/CMakeLists.gl.txt
index fc5c38fe2..6981fbc49 100644
--- a/tests/texturing/CMakeLists.gl.txt
+++ b/tests/texturing/CMakeLists.gl.txt
@@ -93,5 +93,6 @@ piglit_add_executable (texsubimage texsubimage.c)
 piglit_add_executable (texture-al texture-al.c)
 piglit_add_executable (texture-rg texture-rg.c)
 piglit_add_executable (teximage-colors teximage-colors.c)
+piglit_add_executable (zero-tex-coord zero-tex-coord.c)
 
 # vim: ft=cmake:
diff --git a/tests/texturing/zero-tex-coord.c b/tests/texturing/zero-tex-coord.c
new file mode 100644
index 000000000..dbbc260b1
--- /dev/null
+++ b/tests/texturing/zero-tex-coord.c
@@ -0,0 +1,256 @@
+/*
+ * Copyright © 2015 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:
+ *    Neil Roberts <neil@linux.intel.com>
+ *
+ */
+
+/** @file zero-tex-coord.c
+ *
+ * Tests various texture sampling functions using constant 0 values
+ * for the arguments. The i965 driver has optimisations for trailing 0
+ * arguments to sampler messages so the intention is to test these
+ * code paths.
+ */
+
+#include "piglit-util-gl.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+	config.supports_gl_compat_version = 10;
+	config.supports_gl_core_version = 31;
+
+	config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+struct sample_function {
+	const char *name;
+	const char *snippet;
+	int glsl_version;
+	const char *extension;
+};
+
+static const struct sample_function
+sample_functions[] = {
+	{ "texture2D", "texture2D(tex, vec2(0.0))", 0 },
+	{ "bias", "texture2D(tex, vec2(0.0), 0.0)", 0 },
+	{ "textureGrad",
+	  "textureGrad(tex, vec2(0.0), vec2(0.0), vec2(0.0))",
+	  130 },
+	{ "texelFetch", "texelFetch(tex, ivec2(0), 0)", 130 },
+	{ "textureLod",
+	  "textureLod(tex, vec2(0.0), 0.0)",
+	  130 },
+	{ "textureSize",
+	  "textureSize(tex, 0) == ivec2(4) ? "
+	  "vec4(0.0, 1.0, 0.0, 1.0) : "
+	  "vec4(1.0, 0.0, 0.0, 1.0)",
+	  130 },
+	{ "textureQueryLOD",
+	  "textureQueryLOD(tex, vec2(0.0)).x == 0.0 ? "
+	  "vec4(0.0, 1.0, 0.0, 1.0) : "
+	  "vec4(1.0, 0.0, 0.0, 1.0)",
+	  0, "GL_ARB_texture_query_lod" },
+	{ "textureGather",
+	  "textureGather(tex, vec2(0.0), 0) == vec4(0.0) ? "
+	  "vec4(0.0, 1.0, 0.0, 1.0) : "
+	  "vec4(1.0, 0.0, 0.0, 1.0)",
+	  130, "GL_ARB_gpu_shader5" },
+};
+
+static const char
+vertex_source[] =
+	"attribute vec2 piglit_vertex;\n"
+	"\n"
+	"void\n"
+	"main()\n"
+	"{\n"
+	"        gl_Position = vec4(piglit_vertex, 0.0, 1.0);\n"
+	"}\n";
+
+static const char
+fragment_source[] =
+	"uniform sampler2D tex;\n"
+	"\n"
+	"void\n"
+	"main()\n"
+	"{\n"
+	"        gl_FragColor = SNIPPET;\n"
+	"}\n";
+
+const struct sample_function *
+sample_function = sample_functions;
+
+static const GLfloat
+green[] = { 0.0f, 1.0f, 0.0f, 1.0f };
+
+static GLuint
+make_tex(void)
+{
+	/* Make a fully mipmapped texture with a green texel on at the
+	 * 0,0 position on the largest mip image and a red texel for
+	 * all of the other positions */
+
+	GLuint tex;
+	int size = 4;
+	int level = 0;
+	GLubyte *image, *p;
+	int y, x;
+
+	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);
+
+	while (size >= 1) {
+		p = image = malloc(size * size * 4);
+
+		for (y = 0; y < size; y++) {
+			for (x = 0; x < size; x++) {
+				if (level == 0 && y == 0 && x == 0) {
+					*(p++) = 0x00;
+					*(p++) = 0xff;
+				} else {
+					*(p++) = 0xff;
+					*(p++) = 0x00;
+				}
+				*(p++) = 0x00;
+				*(p++) = 0x00;
+			}
+		}
+
+		glTexImage2D(GL_TEXTURE_2D,
+			     level,
+			     GL_RGBA,
+			     size, size,
+			     0, /* border */
+			     GL_RGBA, GL_UNSIGNED_BYTE,
+			     image);
+
+		free(image);
+
+		size /= 2;
+		level++;
+	}
+
+	return tex;
+}
+
+static GLuint
+make_program(void)
+{
+	const char *snippet = sample_function->snippet;
+	int glsl_version = sample_function->glsl_version;
+	int snippet_length = strlen(snippet);
+	int snippet_pos = strstr(fragment_source, "SNIPPET") - fragment_source;
+	GLuint program;
+	char source[1000], *p = source;
+
+	if (glsl_version > 0) {
+		p += sprintf(p, "#version %i\n", glsl_version);
+		piglit_require_GLSL_version(glsl_version);
+	}
+
+	if (sample_function->extension) {
+		p += sprintf(p,
+			     "#extension %s : require\n",
+			     sample_function->extension);
+		piglit_require_extension(sample_function->extension);
+	}
+
+	memcpy(p, fragment_source, snippet_pos);
+	p += snippet_pos;
+	memcpy(p, snippet, snippet_length);
+	p += snippet_length;
+	memcpy(p,
+	       fragment_source + snippet_pos + 7,
+	       sizeof fragment_source - snippet_pos - 7);
+
+	program = piglit_build_simple_program(vertex_source, source);
+
+	return program;
+}
+
+enum piglit_result
+piglit_display(void)
+{
+	GLboolean pass = GL_TRUE;
+	GLuint program, tex;
+	GLint tex_location;
+
+	tex = make_tex();
+	program = make_program();
+
+	glUseProgram(program);
+	tex_location = glGetUniformLocation(program, "tex");
+	glUniform1i(tex_location, 0);
+
+	piglit_draw_rect(-1.0f, -1.0f, 2.0f, 2.0f);
+
+	glUseProgram(0);
+
+	glDeleteTextures(1, &tex);
+	glDeleteProgram(program);
+
+	pass = piglit_probe_rect_rgb(0, 0,
+				     piglit_width, piglit_height,
+				     green) && pass;
+
+	piglit_present_results();
+
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+	int i;
+
+	if (argc > 1) {
+		for (i = 0; i < ARRAY_SIZE(sample_functions); i++) {
+			if (!strcmp(sample_functions[i].name, argv[1])) {
+				sample_function = sample_functions + i;
+				goto found;
+			}
+		}
+
+		fprintf(stderr, "Unknown function: %s\n", argv[1]);
+		piglit_report_result(PIGLIT_FAIL);
+
+	found:
+		(void) 0;
+	}
+
+	piglit_require_GLSL();
+}