[Piglit] [PATCH] [v3] Add test case of render FBO with point coordinate.

[Jian Zhao]

Add test case of rendering with point coordinate, it should work with
direct rendering, rendering with FBO.

As the es spec 2.0.25 says:
"the gl-PointCoord fragment shader input defines a per-fragment coordinate
space (s; t) where s varies from 0 to 1 across the point horizontally
left-to-right, and t ranges from 0 to 1 across the point vertically
top-to-bottom."

v2: To simplify the case, set the point size in the program instead of the
shader. (per Yuanhan's suggestion)

v3: Put the case in the fbo directory, move the FBO setup code into
piglit_init and will not draw it to the screen when run with '-auto'
option. (per Ian's suggestion)

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=44613
Signed-off-by: Jian Zhao <jian.j.zhao at intel.com>
---
 tests/all.tests               |    1 +
 tests/fbo/CMakeLists.gl.txt   |    1 +
 tests/fbo/fbo-gl_pointcoord.c |  112 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 114 insertions(+), 0 deletions(-)
 create mode 100644 tests/fbo/fbo-gl_pointcoord.c

diff --git a/tests/all.tests b/tests/all.tests
index 3424578..38a067b 100644
--- a/tests/all.tests
+++ b/tests/all.tests
@@ -191,6 +191,7 @@ add_plain_test(fbo, 'fbo-generatemipmap-nonsquare')
 add_plain_test(fbo, 'fbo-generatemipmap-npot')
 add_plain_test(fbo, 'fbo-generatemipmap-viewport')
 add_plain_test(fbo, 'fbo-getframebufferattachmentparameter-01')
+add_plain_test(fbo, 'fbo-gl_pointcoord')
 add_plain_test(fbo, 'fbo-incomplete-texture-01')
 add_plain_test(fbo, 'fbo-incomplete-texture-02')
 add_plain_test(fbo, 'fbo-incomplete-texture-03')
diff --git a/tests/fbo/CMakeLists.gl.txt b/tests/fbo/CMakeLists.gl.txt
index 6b5e32c..f355144 100644
--- a/tests/fbo/CMakeLists.gl.txt
+++ b/tests/fbo/CMakeLists.gl.txt
@@ -59,6 +59,7 @@ add_executable (fbo-generatemipmap-nonsquare fbo-generatemipmap-nonsquare.c)
 add_executable (fbo-generatemipmap-npot fbo-generatemipmap-npot.c)
 add_executable (fbo-generatemipmap-viewport fbo-generatemipmap-viewport.c)
 add_executable (fbo-getframebufferattachmentparameter-01 fbo-getframebufferattachmentparameter-01.c)
+add_executable (fbo-gl_pointcoord fbo-gl_pointcoord.c)
 add_executable (fbo-incomplete-texture-01 fbo-incomplete-texture-01.c)
 add_executable (fbo-incomplete-texture-02 fbo-incomplete-texture-02.c)
 add_executable (fbo-incomplete-texture-03 fbo-incomplete-texture-03.c)
diff --git a/tests/fbo/fbo-gl_pointcoord.c b/tests/fbo/fbo-gl_pointcoord.c
new file mode 100644
index 0000000..8db6ad4
--- /dev/null
+++ b/tests/fbo/fbo-gl_pointcoord.c
@@ -0,0 +1,112 @@
+/*
+ * Copyright © 2012 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.
+ *
+ *
+ */
+
+/**
+ * \file pointcoord.c
+ * Verify that applications can use point coordinate correctly with FBO.
+ */
+
+#include "piglit-util.h"
+
+int piglit_width = 100, piglit_height = 100;
+int piglit_window_mode = GLUT_RGB | GLUT_SINGLE;
+
+static const char vs_text[] =
+	"#version 120 \n"
+	"void main()\n"
+	"{\n"
+	"gl_Position = gl_Vertex;\n"
+	"}\n"
+	;
+
+static const char fs_text[] =
+	"#version 120 \n"
+	"void main() { gl_FragColor = vec4(gl_PointCoord.x, gl_PointCoord.y, 0.0, 1.0); }\n"
+	;
+static GLuint prog;
+static GLuint fb, rb;
+
+static const float green[] = { 0.0, 1.0, 0.0, 1.0 };
+static const float black[] = { 0.0, 0.0, 0.0, 1.0 };
+
+enum piglit_result
+piglit_display(void)
+{
+	GLboolean pass = GL_TRUE;
+
+	glClearColor(0.0, 0.0, 0.0, 1.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+	glBegin(GL_POINTS);
+	glVertex2f(0.0, 0.0);
+	glEnd();
+
+	glBindFramebuffer(GL_READ_FRAMEBUFFER, fb);
+	pass = piglit_probe_pixel_rgb(0, 0, black) && pass;
+	pass = piglit_probe_pixel_rgb(18, 18, green) && pass;
+	pass = piglit_probe_pixel_rgb(18, 81, black) && pass;
+
+	/* Draw the point out if want to have a look. */
+	if (!piglit_automatic){
+		glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+		glBlitFramebuffer(0, 0, 100, 100, 0, 0, 100, 100, GL_COLOR_BUFFER_BIT, GL_NEAREST);
+		glFlush();
+	}
+
+
+	pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
+
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+	GLuint vs, fs;
+	int PointSize = 64;
+
+	piglit_require_extension("GL_ARB_point_sprite");
+	piglit_require_extension("GL_ARB_framebuffer_object");
+
+	glEnable(GL_POINT_SPRITE_ARB);
+	glPointSize(PointSize);
+
+	piglit_require_vertex_shader();
+	piglit_require_fragment_shader();
+
+	fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fs_text);
+	vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_text);
+	prog = piglit_link_simple_program(vs, fs);
+
+	piglit_UseProgram(prog);
+
+	glGenRenderbuffers(1, &rb);
+	glBindRenderbuffer(GL_RENDERBUFFER, rb);
+	glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA, 100, 100);
+
+	glGenFramebuffers(1, &fb);
+	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fb);
+	glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+				  GL_RENDERBUFFER, rb);
+}
-- 
1.7.0.1