gl-2.0: port const vertex attrib webgl test to piglit

This is a rip off of:

https://www.khronos.org/registry/webgl/conformance-suites/1.0.2/conformance/attribs/gl-vertex-attrib-render.html

Which presently fails with gallium drivers. The logic is identical, just
ported to GL and piglit infra.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

3 files changed, 138 insertions, 0 deletions

diff --git a/tests/all.py b/tests/all.py
index b2266db38..93bf120b6 100644
--- a/tests/all.py
+++ b/tests/all.py
@@ -1049,6 +1049,7 @@ with profile.group_manager(
     g(['gl-2.0-edgeflag'])
     g(['gl-2.0-edgeflag-immediate'])
     g(['gl-2.0-vertexattribpointer'])
+    g(['gl-2.0-vertex-const-attr'])
     g(['attrib-assignments'], run_concurrent=False)
     g(['getattriblocation-conventional'], run_concurrent=False)
     g(['clip-flag-behavior'], run_concurrent=False)
diff --git a/tests/spec/gl-2.0/CMakeLists.gl.txt b/tests/spec/gl-2.0/CMakeLists.gl.txt
index 3ac0d68be..2ce99bdab 100644
--- a/tests/spec/gl-2.0/CMakeLists.gl.txt
+++ b/tests/spec/gl-2.0/CMakeLists.gl.txt
@@ -14,3 +14,4 @@ piglit_add_executable (vertex-program-two-side vertex-program-two-side.c)
 piglit_add_executable (gl-2.0-edgeflag edgeflag.c)
 piglit_add_executable (gl-2.0-edgeflag-immediate edgeflag-immediate.c)
 piglit_add_executable (gl-2.0-vertexattribpointer vertexattribpointer.c)
+piglit_add_executable (gl-2.0-vertex-const-attr vertex-const-attr.c)
diff --git a/tests/spec/gl-2.0/vertex-const-attr.c b/tests/spec/gl-2.0/vertex-const-attr.c
new file mode 100644
index 000000000..33b01f727
--- /dev/null
+++ b/tests/spec/gl-2.0/vertex-const-attr.c
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2012 The Khronos Group 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.
+ *
+ * Adapted for Piglit and OpenGL by:
+ *   Ilia Mirkin
+ */
+
+/**
+ * Test glVertexAtribNfv changes and redraws without changing any other state
+ */
+
+#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;
+PIGLIT_GL_TEST_CONFIG_END
+
+static const char *vs =
+	"attribute vec2 vertex; \n"
+	"attribute vec4 attr; \n"
+	"varying vec4 color; \n"
+	"void main() { \n"
+	"  gl_Position = vec4(vertex, 0, 1); \n"
+	"  color = attr; \n"
+	"}\n";
+
+static const char *fs =
+	"varying vec4 color; \n"
+	"void main() { gl_FragColor = color; } \n";
+
+static GLint prog, attr;
+
+enum piglit_result
+piglit_display(void)
+{
+	float color[4][4] = {
+		{1, 0, 0, 1},
+		{0, 1, 0, 1},
+		{0, 0, 1, 1},
+		{1, 1, 1, 1},
+	};
+	bool pass = true;
+
+	glViewport(0, 0, piglit_width, piglit_height);
+	glClearColor(0.5, 0.5, 0.5, 0.5);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	glVertexAttrib1fv(attr, color[0]);
+	glViewport(0, 0, piglit_width/2, piglit_height/2);
+	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+	glVertexAttrib2fv(attr, color[1]);
+	glViewport(0, piglit_height/2, piglit_width/2, piglit_height/2);
+	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+	glVertexAttrib3fv(attr, color[2]);
+	glViewport(piglit_width/2, 0, piglit_width/2, piglit_height/2);
+	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+	glVertexAttrib4fv(attr, color[3]);
+	glViewport(piglit_width/2, piglit_height/2,
+		   piglit_width/2, piglit_height/2);
+	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+	pass &= piglit_probe_rect_rgba(0, 0,
+				       piglit_width / 2, piglit_height / 2,
+				       color[0]);
+	pass &= piglit_probe_rect_rgba(0, piglit_height / 2,
+				       piglit_width / 2, piglit_height / 2,
+				       color[1]);
+	pass &= piglit_probe_rect_rgba(piglit_width / 2, 0,
+				       piglit_width / 2, piglit_height / 2,
+				       color[2]);
+	pass &= piglit_probe_rect_rgba(piglit_width / 2, piglit_height / 2,
+				       piglit_width / 2, piglit_height / 2,
+				       color[3]);
+
+	piglit_present_results();
+
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+static const float verts[4][2] = {
+	{-1, -1},
+	{ 1, -1},
+	{-1,  1},
+	{ 1,  1},
+	};
+
+void
+piglit_init(int argc, char **argv)
+{
+	GLuint buf;
+	GLint vertex;
+
+	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);
+	}
+
+	glUseProgram(prog);
+
+	attr = glGetAttribLocation(prog, "attr");
+	vertex = glGetAttribLocation(prog, "vertex");
+
+	glGenBuffers(1, &buf);
+	glBindBuffer(GL_ARRAY_BUFFER, buf);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(verts), verts, GL_STATIC_DRAW);
+	glVertexAttribPointer(vertex,
+			      2, GL_FLOAT, GL_FALSE, 0, 0);
+
+	glEnableVertexAttribArray(vertex);
+}