[Piglit] [PATCH 2/2] gl-2.0-vertex-attr-0: new test of glVertexAttrib(index=0)

[Brian Paul]

See bugzilla https://bugs.freedesktop.org/show_bug.cgi?id=101941
---
 tests/all.py                        |   1 +
 tests/spec/gl-2.0/CMakeLists.gl.txt |   1 +
 tests/spec/gl-2.0/vertex-attr-0.c   | 116 ++++++++++++++++++++++++++++++++++++
 3 files changed, 118 insertions(+)
 create mode 100644 tests/spec/gl-2.0/vertex-attr-0.c

diff --git a/tests/all.py b/tests/all.py
index d8a17ba..ff2ff1f 100644
--- a/tests/all.py
+++ b/tests/all.py
@@ -1096,6 +1096,7 @@ with profile.test_list.group_manager(
     g(['gl-2.0-two-sided-stencil'])
     g(['gl-2.0-vertexattribpointer'])
     g(['gl-2.0-vertexattribpointer-size-3'])
+    g(['gl-2.0-vertex-attr-0'])
     g(['gl-2.0-vertex-const-attr'])
     g(['gl-2.0-reuse_fragment_shader'])
     g(['attrib-assignments'], run_concurrent=False)
diff --git a/tests/spec/gl-2.0/CMakeLists.gl.txt b/tests/spec/gl-2.0/CMakeLists.gl.txt
index 50f3678..ce62799 100644
--- a/tests/spec/gl-2.0/CMakeLists.gl.txt
+++ b/tests/spec/gl-2.0/CMakeLists.gl.txt
@@ -17,5 +17,6 @@ piglit_add_executable (gl-2.0-link-empty-prog glsl-link-empty-prog.c)
 piglit_add_executable (gl-2.0-two-sided-stencil two-sided-stencil.c)
 piglit_add_executable (gl-2.0-vertexattribpointer vertexattribpointer.c)
 piglit_add_executable (gl-2.0-vertexattribpointer-size-3 vertexattribpointer-size-3.c)
+piglit_add_executable (gl-2.0-vertex-attr-0 vertex-attr-0.c)
 piglit_add_executable (gl-2.0-vertex-const-attr vertex-const-attr.c)
 piglit_add_executable (gl-2.0-reuse_fragment_shader reuse_fragment_shader.c)
diff --git a/tests/spec/gl-2.0/vertex-attr-0.c b/tests/spec/gl-2.0/vertex-attr-0.c
new file mode 100644
index 0000000..ea050ec
--- /dev/null
+++ b/tests/spec/gl-2.0/vertex-attr-0.c
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2017 VMware, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and/or associated documentation files (the
+ * "Materials"), to deal in the Materials without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Materials, and to
+ * permit persons to whom the Materials are furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Materials.
+ *
+ * THE MATERIALS ARE 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
+ * MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+ *
+ */
+
+/**
+ * Test glVertexAttrib(index=0).
+ * Brian Paul
+ * 22 Aug 2017
+ */
+
+#include "piglit-util-gl.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+	config.supports_gl_compat_version = 20;
+	config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
+	config.khr_no_error_support = PIGLIT_NO_ERRORS;
+PIGLIT_GL_TEST_CONFIG_END
+
+static const char *vs =
+	"attribute vec4 color_in; \n"
+	"varying vec4 color; \n"
+	"void main() { \n"
+	"  gl_Position = gl_Vertex; \n"
+	"  color = color_in; \n"
+	"}\n";
+
+static const char *fs =
+	"varying vec4 color; \n"
+	"void main() \n"
+	"{ \n"
+	"   gl_FragColor = color;\n"
+	"} \n";
+
+static GLint prog;
+
+
+enum piglit_result
+piglit_display(void)
+{
+	static const float color[4][4] = {
+		{1, 0, 0, 1},
+		{0, 1, 0, 1},
+		{0, 0, 1, 1},
+		{1, 1, 1, 1},
+	};
+	static const float verts[4][2] = {
+		{-1, -1},
+		{ 1, -1},
+		{ 1,  1},
+		{-1,  1},
+	};
+	GLint i, color_in;
+	bool pass = true;
+
+	glViewport(0, 0, piglit_width, piglit_height);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	glUseProgram(prog);
+
+	color_in = glGetAttribLocation(prog, "color_in");
+	printf("color_in at locagion %d\n", color_in);
+
+	/* draw quad */
+	glBegin(GL_TRIANGLE_FAN);
+	for (i = 0; i < 4; i++) {
+		/* update generic attribute */
+		glVertexAttrib4fv(color_in, color[i]);
+		/* emit vertes */
+		glVertexAttrib2fv(0, verts[i]);
+	}
+	glEnd();
+
+	/* probe four corners */
+	pass &= piglit_probe_pixel_rgba(0, 0, color[0]);
+	pass &= piglit_probe_pixel_rgba(piglit_width - 1, 0, color[1]);
+	pass &= piglit_probe_pixel_rgba(piglit_width - 1, piglit_height - 1,
+					color[2]);
+	pass &= piglit_probe_pixel_rgba(0, piglit_height -1, color[3]);
+
+	piglit_present_results();
+
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+
+void
+piglit_init(int argc, char **argv)
+{
+	piglit_require_gl_version(20);
+
+	prog = piglit_build_simple_program(vs, fs);
+	if (!prog) {
+		printf("Failed to compile/link program\n");
+		piglit_report_result(PIGLIT_FAIL);
+	}
+}
-- 
1.9.1