[Piglit] [PATCH] fs-texelFetch-2D: add a test for the GLSL 1.30 texelFetch function (v2)

[Dave Airlie]

From: Dave Airlie <airlied at redhat.com>

This is just an initial simple test that just does enough to test TXF
development.

v2: add some lod testing, not sure what is defined at 1x1 and 2x2 miplevels.

Signed-off-by: Dave Airlie <airlied at redhat.com>
---
 tests/spec/glsl-1.30/execution/CMakeLists.gl.txt  |    1 +
 tests/spec/glsl-1.30/execution/fs-texelFetch-2D.c |  132 +++++++++++++++++++++
 2 files changed, 133 insertions(+), 0 deletions(-)
 create mode 100644 tests/spec/glsl-1.30/execution/fs-texelFetch-2D.c

diff --git a/tests/spec/glsl-1.30/execution/CMakeLists.gl.txt b/tests/spec/glsl-1.30/execution/CMakeLists.gl.txt
index d8b9e1c..2b00124 100644
--- a/tests/spec/glsl-1.30/execution/CMakeLists.gl.txt
+++ b/tests/spec/glsl-1.30/execution/CMakeLists.gl.txt
@@ -14,3 +14,4 @@ link_libraries (
 )
 
 add_executable (fs-textureSize-2D fs-textureSize-2D.c)
+add_executable (fs-texelFetch-2D fs-texelFetch-2D.c)
diff --git a/tests/spec/glsl-1.30/execution/fs-texelFetch-2D.c b/tests/spec/glsl-1.30/execution/fs-texelFetch-2D.c
new file mode 100644
index 0000000..b39f3bf
--- /dev/null
+++ b/tests/spec/glsl-1.30/execution/fs-texelFetch-2D.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright © 2011 Dave Airlie
+ *
+ * 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 fs-texelFetch-2D.c
+ *
+ * Tests the built-in function texelFetch() in the fragment shader.
+ *
+ * Creates a mipmapped 64x32 2D texture and draws a series of squares whose
+ * color contains a texel fetched from each quadrant of the rgbw texture.
+ */
+#include "piglit-util.h"
+
+int piglit_width = 90, piglit_height = 150;
+int piglit_window_mode = GLUT_RGBA | GLUT_DOUBLE;
+
+const int tex_size = 64;
+
+static int x_location, y_location, lod_location;
+
+static const char vert[] =
+"#version 130\n"
+"void main()\n"
+"{\n"
+"	gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
+"}\n";
+
+static const char frag[] =
+"#version 130\n"
+"uniform int x, y, lod;\n"
+"uniform sampler2D tex;\n"
+"void main()\n"
+"{\n"
+"	ivec2 pos = ivec2(x, y);\n"
+"       vec4 texel = texelFetch(tex, pos, lod);\n"
+"	gl_FragColor = texel;\n"
+"}\n";
+
+static inline float max(float x, float y) { return (x > y) ? x : y; }
+
+enum piglit_result
+piglit_display(void)
+{
+	int l, q;
+	bool pass = true;
+	float red[4]   = {1.0, 0.0, 0.0, 1.0};
+	float green[4] = {0.0, 1.0, 0.0, 1.0};
+	float blue[4]  = {0.0, 0.0, 1.0, 1.0};
+	float white[4] = {1.0, 1.0, 1.0, 1.0};
+
+	glClearColor(0.5, 0.5, 0.5, 1.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	for (l = 0; (tex_size >> l) > 0; l++) {
+		const int width = tex_size >> l;
+		const int height = max(width / 2, 1);
+		const int y = 10 + 20 * l;
+
+		piglit_Uniform1i(lod_location, l);
+
+		/* Draw 4 squares with a color sample for each quad */
+		for (q = 0; q < 4; q++) {
+			const int tex_x = (q / 2) * ((width / 2));
+			const int tex_y = (q % 2) * ((height / 2));
+			float *c;
+			const int x = 10+20*q;
+
+			if (q == 0) c = red;
+			else if (q == 1) c = blue;
+			else if (q == 2) c = green;
+			else if (q == 3) c = white;
+
+			piglit_Uniform1i(x_location, tex_x);
+			piglit_Uniform1i(y_location, tex_y);
+			piglit_draw_rect(x, y, 10, 10);
+
+			if (width > 2) /* below 1 wide no test */
+				pass &= piglit_probe_rect_rgba(x, y, 10, 10, c);
+		}
+	}
+
+	glutSwapBuffers();
+
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+	int vs, fs, prog;
+	int tex_location;
+
+	piglit_require_GLSL_version(130);
+
+	glActiveTexture(GL_TEXTURE0);
+	piglit_rgbw_texture(GL_RGBA, tex_size, tex_size / 2, true, false,
+			    GL_UNSIGNED_NORMALIZED);
+
+	piglit_ortho_projection(piglit_width, piglit_height, false);
+
+	vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vert);
+	fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, frag);
+	prog = piglit_link_simple_program(vs, fs);
+
+	tex_location = piglit_GetUniformLocation(prog, "tex");
+	lod_location = piglit_GetUniformLocation(prog, "lod");
+	x_location = piglit_GetUniformLocation(prog, "x");
+	y_location = piglit_GetUniformLocation(prog, "y");
+
+	piglit_UseProgram(prog);
+	piglit_Uniform1i(tex_location, 0);
+}
-- 
1.7.6