[Mesa-dev] [PATCH] Added a fbo test for multiple drawbuffer, with additive blending enabled The blend is the same for each drawbuffer.

Julian Adams joolsa at gmail.com
Wed Mar 30 15:08:40 PDT 2011


---
 tests/all.tests                       |    1 +
 tests/fbo/CMakeLists.gl.txt           |    1 +
 tests/fbo/fbo-drawbuffers-blend-add.c |  251 +++++++++++++++++++++++++++++++++
 3 files changed, 253 insertions(+), 0 deletions(-)
 create mode 100644 tests/fbo/fbo-drawbuffers-blend-add.c

diff --git a/tests/all.tests b/tests/all.tests
index c2c58ae..eb86ae7 100644
--- a/tests/all.tests
+++ b/tests/all.tests
@@ -130,6 +130,7 @@ add_plain_test(fbo, 'fbo-depthtex')
 add_plain_test(fbo, 'fbo-depth-sample-compare')
 add_plain_test(fbo, 'fbo-drawbuffers')
 add_plain_test(fbo, 'fbo-drawbuffers-arbfp')
+add_plain_test(fbo, 'fbo-drawbuffers-blend-add')
 add_plain_test(fbo, 'fbo-drawbuffers-fragcolor')
 add_plain_test(fbo, 'fbo-drawbuffers-maxtargets')
 add_plain_test(fbo, 'fbo-drawbuffers2-blend')
diff --git a/tests/fbo/CMakeLists.gl.txt b/tests/fbo/CMakeLists.gl.txt
index 819d5cf..999c0c4 100644
--- a/tests/fbo/CMakeLists.gl.txt
+++ b/tests/fbo/CMakeLists.gl.txt
@@ -36,6 +36,7 @@ add_executable (fbo-clearmipmap fbo-clearmipmap.c)
 add_executable (fbo-clear-formats fbo-clear-formats.c)
 add_executable (fbo-drawbuffers fbo-drawbuffers.c)
 add_executable (fbo-drawbuffers-arbfp fbo-drawbuffers-arbfp.c)
+add_executable (fbo-drawbuffers-blend-add fbo-drawbuffers-blend-add.c)
 add_executable (fbo-drawbuffers-fragcolor fbo-drawbuffers-fragcolor.c)
 add_executable (fbo-drawbuffers-maxtargets fbo-drawbuffers-maxtargets.c)
 add_executable (fbo-drawbuffers2-blend fbo-drawbuffers2-blend.c)
diff --git a/tests/fbo/fbo-drawbuffers-blend-add.c b/tests/fbo/fbo-drawbuffers-blend-add.c
new file mode 100644
index 0000000..d6fce41
--- /dev/null
+++ b/tests/fbo/fbo-drawbuffers-blend-add.c
@@ -0,0 +1,251 @@
+/*
+ * Copyright © 2010 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:
+ *	  Eric Anholt <eric at anholt.net>
+ *	  Marek Olšák <maraeo at gmail.com>
+ *
+ */
+
+/** @file fbo-drawbuffers-blend-add.c
+ *
+ * Tests that additive blending is enabled for all render targets with ARB_draw_buffers.
+ */
+
+#include <string.h>
+#include "piglit-util.h"
+
+int piglit_width = 256;
+int piglit_height = 256;
+int piglit_window_mode = GLUT_RGB | GLUT_ALPHA | GLUT_DOUBLE;
+
+static GLint max_targets;
+
+static char *vs_source =
+	"void main()\n"
+	"{\n"
+	"	gl_Position = gl_Vertex;\n"
+	"}\n";
+
+static char *fs_source_start =
+	"void main()\n"
+	"{\n";
+
+static char *fs_source_output =
+	"	gl_FragData[%d].xyzw = vec4(%f, %f, %f, %f);\n";
+
+static char *fs_source_end =
+	"}\n"; 
+
+float output_values[] = {
+	0.0, 0.5, 0.0, 0.0,
+	0.0, 0.0, 0.5, 0.0,
+	0.0, 0.5, 0.5, 0.0, 
+	0.5, 0.5, 0.0, 0.0,
+	
+	0.0, 0.5, 0.0, 0.5,
+	0.0, 0.0, 0.5, 0.5,
+	0.0, 0.5, 0.5, 0.5, 
+	0.5, 0.5, 0.0, 0.5,
+
+	0.0, 0.25, 0.0, 0.0,
+	0.0, 0.0, 0.25, 0.0,
+	0.0, 0.25, 0.25, 0.0, 
+	0.25, 0.25, 0.0, 0.0,
+	
+	0.0, 0.25, 0.0, 0.25,
+	0.0, 0.0, 0.25, 0.25,
+	0.0, 0.25, 0.25, 0.25, 
+	0.25, 0.25, 0.0, 0.25};
+
+float clear_value = 0.25;
+
+static GLuint
+attach_texture(int i)
+{
+	GLuint tex;
+
+	glGenTextures(1, &tex);
+	glBindTexture(GL_TEXTURE_2D, tex);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
+			 32, 32, 0,
+			 GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+	glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
+				  GL_COLOR_ATTACHMENT0_EXT + i,
+				  GL_TEXTURE_2D,
+				  tex,
+				  0);
+	assert(glGetError() == 0);
+
+	return tex;
+}
+
+static void
+generate_and_display_drawbuffers(int count)
+{
+	GLuint tex[16], fb, fs, vs, prog;
+	GLenum attachments[16], status;
+	int i;
+
+	glGenFramebuffersEXT(1, &fb);
+	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
+
+	for (i = 0; i < count; i++) {
+		tex[i] = attach_texture(i);
+		attachments[i] = GL_COLOR_ATTACHMENT0 + i;
+	}
+
+	status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
+	if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+		fprintf(stderr, "fbo incomplete (status = 0x%04x)\n", status);
+		piglit_report_result(PIGLIT_SKIP);
+	}
+
+	glDrawBuffersARB(count, attachments);
+
+	/* Clear all to 0.25 so we see if the shader rendering happens. */
+	glClearColor(clear_value, clear_value, clear_value, clear_value);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	/* Build the shader that spams green to all outputs. */
+	vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_source);
+
+	char fs_output_line[256];
+	char fs_full_source[1024];
+
+	strcpy(fs_full_source, fs_source_start);
+		
+	for (i = 0; i < count; i++) {
+		sprintf(fs_output_line, fs_source_output, i, output_values[i * 4], 
+				output_values[(i * 4) + 1], output_values[(i * 4) + 2], 
+				output_values[(i * 4) + 3]);
+		
+		strcat(fs_full_source, fs_output_line);
+	}
+	
+	strcat(fs_full_source, fs_source_end);
+
+	assert(strlen(fs_full_source) + 1 < sizeof(fs_full_source) / sizeof(fs_full_source[0]));
+	
+	fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fs_full_source);
+
+	prog = piglit_link_simple_program(vs, fs);
+	glUseProgram(prog);
+
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_ONE, GL_ONE);
+	glBlendEquation(GL_FUNC_ADD);
+
+	/* Now render to all the color buffers. */
+	piglit_draw_rect(-1, -1, 2, 2);
+
+	glDisable(GL_BLEND);
+	
+	/* OK, now draw each of these textures to the winsys framebuffer. */
+	glUseProgram(0);
+	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+	piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
+	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+	glEnable(GL_TEXTURE_2D);
+	for (i = 0; i < count; i++) {
+		glBindTexture(GL_TEXTURE_2D, tex[i]);
+		piglit_draw_rect_tex(16 * i, 16 * (count - 1),
+					 16, 16,
+					 0, 0,
+					 1, 1);
+	}
+	glDisable(GL_TEXTURE_2D);
+
+	for (i = 0; i < count; i++) {
+		glDeleteTextures(1, &tex[i]);
+	}
+	glDeleteFramebuffersEXT(1, &fb);
+}
+
+enum piglit_result
+piglit_display(void)
+{
+	#define N_VECTOR_ITEMS 4
+	GLboolean pass = GL_TRUE;
+	int count, i, j;
+	float expected[N_VECTOR_ITEMS] = {0};
+	
+
+	glClearColor(0.5, 0.5, 0.5, 0.5);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	for (count = 1; count <= max_targets; count++) {
+		generate_and_display_drawbuffers(count);
+	}
+
+	for (count = 1; count <= max_targets; count++) {
+		for (i = 0; i < count; i++) {
+			for (j = 0; j < N_VECTOR_ITEMS; j++) {
+				expected[j] = output_values[(i * N_VECTOR_ITEMS) + j] + 
+					clear_value;
+			}
+	
+			pass = pass &&
+				piglit_probe_pixel_rgba(16 * i + 8,
+							   16 * (count - 1) + 8,
+							   expected);
+		}
+	}
+	
+	glutSwapBuffers();
+
+	return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+	GLint max_attachments;
+
+	printf("The result should be a rows of boxes of differing colors, \n"
+		   "one for each drawbuffer target used (none black).\n");
+
+	piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
+
+	if (!GLEW_VERSION_2_0) {
+		printf("Requires OpenGL 2.0\n");
+		piglit_report_result(PIGLIT_SKIP);
+	}
+
+	piglit_require_extension("GL_EXT_framebuffer_object");
+	piglit_require_extension("GL_ARB_draw_buffers");
+
+	glGetIntegerv(GL_MAX_DRAW_BUFFERS_ARB, &max_targets);
+	if (max_targets < 2)
+		piglit_report_result(PIGLIT_SKIP);
+
+	glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS_EXT, &max_attachments);
+	if (max_targets > max_attachments)
+		max_targets = max_attachments;
+
+	if (max_targets > 16)
+		max_targets = 16;
+}
-- 
1.7.1



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