[Piglit] [PATCH 02/12] msaa: Add files containing the shared code to test multiple draw buffers
Anuj Phogat
anuj.phogat at gmail.com
Mon Jul 16 15:50:00 PDT 2012
Functions defined in these files are utilized by following test cases:
draw-buffers-alpha-to-one
int-draw-buffers-alpha-to-one
draw-buffers-alpha-to-coverage
int-draw-buffers-alpha-to-coverage
V2: Removed unnecessary conditional checks
Switched to shared visualize_image function
Updated few comments
Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
---
.../draw-buffers-common.cpp | 705 ++++++++++++++++++++
.../draw-buffers-common.h | 61 ++
2 files changed, 766 insertions(+), 0 deletions(-)
create mode 100644 tests/spec/ext_framebuffer_multisample/draw-buffers-common.cpp
create mode 100644 tests/spec/ext_framebuffer_multisample/draw-buffers-common.h
diff --git a/tests/spec/ext_framebuffer_multisample/draw-buffers-common.cpp b/tests/spec/ext_framebuffer_multisample/draw-buffers-common.cpp
new file mode 100644
index 0000000..7987833
--- /dev/null
+++ b/tests/spec/ext_framebuffer_multisample/draw-buffers-common.cpp
@@ -0,0 +1,705 @@
+/*
+ * 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.
+ */
+
+#include "draw-buffers-common.h"
+
+/**
+ * \file draw-buffers-common.cpp
+ *
+ * This file provides utility functions to draw a test pattern to multiple draw
+ * buffers attached to a FBO with GL_SAMPLE_ALPHA_TO_{COVERAGE, ONE}
+ * enabled / disabled.
+ *
+ * Expected color values are computed for each draw buffer based on the enabled
+ * GL_SAMPLE_ALPHA_TO_{COVERAGE, ONE} flags and coverage value used to draw the
+ * test pattern.
+ *
+ * Reference image for each draw buffer is drawn in to right half of default
+ * framebuffer. It is used to verify the accuracy of test image as well as to
+ * visually compare the difference caused by enabling above flags.
+ *
+ * Test image is drawn with the same test pattern in multisample buffer with
+ * GL_SAMPLE_ALPHA_TO_{COVERAGE, ONE} enabled. All multisample draw buffers
+ * are sequentially resolved by blitting them to a single sample FBO. resolve_fbo
+ * is then blitted to left half of window system framebuffer with appropriate y
+ * offset. This produces three test images in the left half, each corresponds to
+ * a color attachment.
+ *
+ * Test image is verified by comparing it with the corresponding reference
+ * image in the right half
+ *
+ * For sample coverage and sample alpha to coverage, test image should be
+ * verified by probing the rectangles in left half of window system framebuffer
+ * and comparing with expected color values. OpenGL 3.0 specification intends to
+ * allow (but not require) the implementation to produce a dithering effect when
+ * the coverage value is not a strict multiple of 1 / num_samples. We will skip
+ * computing expected values and probing for such rectangles. They are drawn
+ * just to look for dithering by human inspection.
+ *
+ * Note:
+ * At present, the test always uses three draw buffers. To test other
+ * numbers of draw buffers, we would have to modify the fragment shader in
+ * nontrivial ways at run time.
+ *
+ * Also, the test always uses GL_RGBA8I as integer format or GL_RGBA as float
+ * format for draw buffer zero.
+ *
+ * Author: Anuj Phogat <anuj.phogat at gmail.com>
+ */
+
+static Fbo ms_fbo, resolve_fbo, resolve_int_fbo;
+static GLbitfield buffer_to_test;
+
+static float *coverage = NULL;
+static float *color = NULL;
+static float *expected = NULL;
+
+static int num_draw_buffers;
+static int num_samples;
+static int num_rects;
+static int prog;
+static int color_loc;
+static int frag_0_color_loc;
+static int alpha_to_coverage_loc;
+static int pattern_width;
+static int pattern_height;
+
+static bool is_buffer_zero_integer_format = false;
+
+static const int num_components = 4; /* for RGBA formats */
+static const int num_color_bits = 8; /* for GL_RGBA & GL_RGBA8I formats */
+
+static const float bg_color[4] = {
+ 0.0, 0.6, 0.0, 0.4 };
+
+/* Testing for three draw buffers is supported */
+static const GLenum draw_buffers[] = {
+ GL_COLOR_ATTACHMENT0_EXT,
+ GL_COLOR_ATTACHMENT1_EXT,
+ GL_COLOR_ATTACHMENT2_EXT };
+
+static const char *vert =
+ "#version 130\n"
+ "in vec2 pos;\n"
+ "uniform float depth;\n"
+ "void main()\n"
+ "{\n"
+ " gl_Position = gl_ModelViewProjectionMatrix * vec4(pos, 0.0, 1.0);\n"
+ "}\n";
+
+/* Fragment shader outputs to three draw buffers. Output different alpha values
+ * to different draw buffers. This is required to verify that alpha values from
+ * draw buffer zero are used to determine the fragment coverage value for all
+ * the draw buffers.
+ */
+static const char *frag_template =
+ "#version 130\n"
+ "#define OUT_TYPE %s\n"
+ "out OUT_TYPE frag_out_0;\n"
+ "out vec4 frag_out_1;\n"
+ "out vec4 frag_out_2;\n"
+ "uniform OUT_TYPE frag_0_color;\n"
+ "uniform vec4 color;\n"
+ "uniform bool alphatocoverage;\n"
+ "void main()\n"
+ "{\n"
+ " frag_out_0 = frag_0_color;\n"
+ " if(alphatocoverage) {\n"
+ " frag_out_1 = vec4(color.rgb, color.a / 2);\n"
+ " frag_out_2 = vec4(color.rgb, color.a / 4);\n"
+ " }\n"
+ " else {\n"
+ " frag_out_1 = frag_out_2 = color;\n"
+ " }\n"
+ "}\n";
+
+const char *
+get_out_type_glsl(void)
+{
+ if(is_buffer_zero_integer_format)
+ return "ivec4";
+ else
+ return "vec4";
+}
+void
+shader_compile(void)
+{
+ /* Compile program */
+ GLint vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vert);
+
+ const char *out_type_glsl = get_out_type_glsl();;
+ unsigned frag_alloc_len = strlen(frag_template) +
+ strlen(out_type_glsl) + 1;
+ char *frag = (char *) malloc(frag_alloc_len);
+ sprintf(frag, frag_template, out_type_glsl);
+
+ GLint fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, frag);
+ prog = piglit_link_simple_program(vs, fs);
+
+ if (!piglit_link_check_status(prog)) {
+ piglit_report_result(PIGLIT_FAIL);
+ }
+ free(frag);
+
+ glBindFragDataLocation(prog, 0, "frag_out_0");
+ /* For multiple draw buffers */
+ if (num_draw_buffers > 1) {
+ glBindFragDataLocation(prog, 1, "frag_out_1");
+ glBindFragDataLocation(prog, 2, "frag_out_2");
+ }
+
+ glBindAttribLocation(prog, 0, "pos");
+ glEnableVertexAttribArray(0);
+
+ /* Linking is rquired after glBindFragDataLocation */
+ piglit_LinkProgram(prog);
+
+ /* Set up uniforms */
+ glUseProgram(prog);
+ color_loc = glGetUniformLocation(prog, "color");
+ frag_0_color_loc = glGetUniformLocation(prog, "frag_0_color");
+ alpha_to_coverage_loc = glGetUniformLocation(prog, "alphatocoverage");
+}
+
+void
+allocate_data_arrays(void)
+{
+ float alpha_scale;
+ /* Draw 2N + 1 rectangles for N samples, each with a unique color
+ * and coverage value
+ */
+ if(num_samples) {
+ num_rects = 2 * num_samples + 1;
+ alpha_scale = (1.0 / (2.0 * num_samples));
+ }
+ else {
+ num_rects = 9;
+ alpha_scale = 0.125;
+ }
+
+ /* Allocate data arrays based on number of samples used */
+ color = (float *) malloc(num_rects * num_components * sizeof(float));
+ coverage = (float *) malloc(num_rects * sizeof(float));
+ expected = (float *) malloc(num_draw_buffers * num_rects *
+ num_components * sizeof(float));
+
+ for(int i = 0; i < num_rects; i++) {
+ unsigned rect_idx = i * num_components;
+ for(int j = 0; j < num_components - 1; j++) {
+ color[rect_idx + j] =
+ (sin((float)(rect_idx + j)) + 1) / 2;
+ }
+ /* Alpha value will be directly used as coverage */
+ if (num_samples)
+ color[rect_idx + 3] = i * alpha_scale;
+ else
+ color[rect_idx + 3] = i * alpha_scale;
+ }
+}
+
+void
+free_data_arrays(void)
+{
+ free(color);
+ color = NULL;
+ free(coverage);
+ coverage = NULL;
+ free(expected);
+ expected = NULL;
+}
+
+void
+float_color_to_int_color(int *dst, float *src)
+{
+ float offset = 1 - pow(2, (num_color_bits - 1));
+ float scale = -2.0 * offset;
+
+ for (int j = 0; j < num_rects; ++j) {
+ for (int k = 0; k < num_components; ++k) {
+ dst[j * num_components + k] =
+ scale * src[j * num_components + k] + offset;
+ }
+ }
+}
+
+void
+draw_pattern(bool sample_alpha_to_coverage,
+ bool sample_alpha_to_one,
+ bool is_reference_image,
+ float *float_color)
+{
+ glUseProgram(prog);
+ glClearColor(bg_color[0], bg_color[1],
+ bg_color[2], bg_color[3]);
+ glClear(buffer_to_test);
+
+ if(!is_reference_image) {
+ if(sample_alpha_to_coverage)
+ glEnable (GL_SAMPLE_ALPHA_TO_COVERAGE);
+ if(sample_alpha_to_one)
+ glEnable (GL_SAMPLE_ALPHA_TO_ONE);
+ }
+ glUniform1i(alpha_to_coverage_loc, sample_alpha_to_coverage);
+
+ unsigned indices[6] = {0, 1, 2, 0, 2, 3};
+ int integer_color[num_rects * num_components];
+
+ /* For integer color buffers convert the color data to integer format */
+ if(is_buffer_zero_integer_format) {
+ float_color_to_int_color(integer_color, float_color);
+ }
+
+ for (int i = 0; i < num_rects; ++i) {
+ float vertices[4][2] = {
+ { 0.0f, 0.0f + i * (pattern_height / num_rects) },
+ { 0.0f, (i + 1.0f) * (pattern_height / num_rects) },
+ { pattern_width, (i + 1.0f) * (pattern_height / num_rects) },
+ { pattern_width, 0.0f + i * (pattern_height / num_rects) } };
+
+ glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE,
+ sizeof(vertices[0]),
+ (void *) vertices);
+
+ glUniform4fv(color_loc, 1, (float_color + i * num_components));
+ if(is_buffer_zero_integer_format) {
+ glUniform4iv(frag_0_color_loc, 1,
+ integer_color + i * num_components);
+ }
+ else {
+ glUniform4fv(frag_0_color_loc, 1,
+ (float_color + i * num_components));
+ }
+ glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT,
+ (void *) indices);
+ }
+ glDisable (GL_SAMPLE_ALPHA_TO_COVERAGE);
+ glDisable (GL_SAMPLE_ALPHA_TO_ONE);
+}
+
+void
+compute_expected(bool sample_alpha_to_coverage,
+ bool sample_alpha_to_one,
+ int draw_buffer_count)
+{
+ int i, j;
+ unsigned buffer_idx_offset = draw_buffer_count *
+ num_rects *
+ num_components;
+
+ /* Compute the coverage value used in the test */
+ if (num_samples &&
+ sample_alpha_to_coverage &&
+ !is_buffer_zero_integer_format) {
+
+ for (i = 0; i < num_rects; i++) {
+ /* Coverage value for all the draw buffers comes from
+ * the fragment alpha values of draw buffer zero
+ */
+ float frag_alpha = color[i * num_components + 3];
+ coverage[i] = (frag_alpha < 1.0) ? frag_alpha : 1.0;
+ }
+ }
+ else {
+ for (i = 0; i < num_rects; i++)
+ coverage[i] = 1.0;
+ }
+
+ /* Coverage value decides the number of samples in multisample buffer
+ * covered by an incoming fragment, which will then receive the
+ * fragment data. When the multisample buffer is resolved it gets
+ * blended with the background color which is written to the remaining
+ * samples.
+ * Page 254 (page 270 of the PDF) of the OpenGL 3.0 spec says:
+ * "The method of combination is not specified, though a simple average
+ * computed independently for each color component is recommended."
+ * This is followed by NVIDIA and AMD in their proprietary drivers.
+ */
+ for (i = 0; i < num_rects; i++) {
+
+ float samples_used = coverage[i] * num_samples;
+ /* Expected color values are computed only for integer
+ * number of samples_used. Non-integer values may result
+ * in dithering effect.
+ */
+ if(samples_used == (int) samples_used) {
+ int rect_idx_offset = buffer_idx_offset +
+ i * num_components;
+ for (j = 0; j < num_components - 1 ; j++) {
+
+ expected[rect_idx_offset + j] =
+ color[i * num_components + j] * coverage[i] +
+ bg_color[j] * (1 - coverage[i]);
+ }
+
+ /* Compute expected alpha values of draw buffers */
+ float frag_alpha = color[i * num_components + 3];
+ int alpha_idx = rect_idx_offset + 3;
+
+ if ((!num_samples &&
+ !sample_alpha_to_coverage) ||
+ is_buffer_zero_integer_format) {
+ /* Taking in account alpha values modified by
+ * fragment shader.
+ */
+ expected[alpha_idx] =
+ is_buffer_zero_integer_format ?
+ frag_alpha / pow(2, draw_buffer_count) :
+ frag_alpha;
+ }
+ else if (sample_alpha_to_coverage) {
+ /* Taking in account alpha values modified by
+ * fragment shader.
+ */
+ frag_alpha /= pow(2, draw_buffer_count);
+ if(sample_alpha_to_one) {
+ expected[alpha_idx] =
+ 1.0 * coverage[i] +
+ bg_color[3] * (1 - coverage[i]);
+ }
+ else {
+ expected[alpha_idx] =
+ frag_alpha * coverage[i] +
+ bg_color[3] * (1 - coverage[i]);
+ }
+ }
+ else {
+ expected[alpha_idx] =
+ sample_alpha_to_one ? 1.0 : frag_alpha;
+ }
+ }
+ }
+}
+
+/* This function probes all the draw buffers blitted to downsampled FBO
+ * (resolve_fbo / resolve_int_fbo) and compare against expected color values.
+ */
+bool
+probe_framebuffer_color(void)
+{
+ bool result = true;
+ int * expected_int_color = NULL;
+ int rect_width = pattern_width;
+ int rect_height = pattern_height / num_rects;
+
+ for (int i = 0; i < num_draw_buffers; i++) {
+ bool is_integer_operation = is_buffer_zero_integer_format && !i;
+
+ if(is_integer_operation) {
+ glBindFramebuffer(GL_READ_FRAMEBUFFER,
+ resolve_int_fbo.handle);
+ expected_int_color = (int*) malloc(num_rects *
+ num_components *
+ sizeof(int));
+ }
+ else {
+ glBindFramebuffer(GL_READ_FRAMEBUFFER,
+ resolve_fbo.handle);
+ }
+
+ for (int j = 0; j < num_rects; j++) {
+ float samples_used = coverage[j] * num_samples;
+ int rect_x = 0;
+ int rect_y = i * pattern_height +
+ j * (pattern_height / num_rects);
+ int rect_idx_offset = (i * num_rects + j) *
+ num_components;
+
+ /* Only probe rectangles with coverage value which is a
+ * strict multiple of 1 / num_samples.
+ */
+ if(samples_used == (int)samples_used) {
+ if(is_integer_operation) {
+ float_color_to_int_color(expected_int_color,
+ expected);
+ result = piglit_probe_rect_rgba_int(
+ rect_x,
+ rect_y,
+ rect_width,
+ rect_height,
+ expected_int_color +
+ rect_idx_offset)
+ && result;
+ }
+ else {
+ result = piglit_probe_rect_rgba(
+ rect_x,
+ rect_y,
+ rect_width,
+ rect_height,
+ expected + rect_idx_offset)
+ && result;
+ }
+ }
+ }
+ }
+ if(expected_int_color)
+ free(expected_int_color);
+ return result;
+}
+
+void
+draw_image_to_window_system_fb(int draw_buffer_count, bool rhs)
+{
+ unsigned rect_x = 0;
+ unsigned rect_y = draw_buffer_count * pattern_height;
+ unsigned array_size = num_components * pattern_width * pattern_height;
+ float *image = (float *) malloc(sizeof(float) * array_size);
+
+ if(is_buffer_zero_integer_format && draw_buffer_count == 0) {
+ glBindFramebuffer(GL_READ_FRAMEBUFFER, resolve_int_fbo.handle);
+ int *tmp = (int *) malloc(sizeof(int) * array_size);
+ glReadPixels(rect_x, rect_y,
+ pattern_width, pattern_height,
+ GL_RGBA_INTEGER,
+ GL_INT, tmp);
+ for (unsigned i = 0; i < array_size; ++i) {
+ image[i] = tmp[i];
+ }
+
+ /* Convert integer color data to float color data */
+ float color_offset = 1.0 - pow(2.0, num_color_bits - 1);
+ float color_scale = -2.0 * color_offset;
+
+ for (unsigned i = 0; i < array_size; ++i) {
+ image[i] = (image[i] - color_offset) / color_scale;
+ }
+ free(tmp);
+ }
+ else{
+ glBindFramebuffer(GL_READ_FRAMEBUFFER, resolve_fbo.handle);
+ glReadPixels(rect_x, rect_y,
+ pattern_width,
+ pattern_height,
+ GL_RGBA,
+ GL_FLOAT, image);
+ }
+ visualize_image(image, GL_RGBA,
+ pattern_width, pattern_height,
+ draw_buffer_count + 1, rhs);
+ free(image);
+}
+
+void
+draw_test_image(bool sample_alpha_to_coverage, bool sample_alpha_to_one)
+{
+ /* Draw test pattern in multisample ms_fbo with
+ * GL_SAMPLE_ALPHA_TO_COVERAGE enabled
+ */
+ glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ms_fbo.handle);
+ glDrawBuffers(num_draw_buffers, draw_buffers);
+ ms_fbo.set_viewport();
+
+ draw_pattern(sample_alpha_to_coverage,
+ sample_alpha_to_one,
+ false /* is_reference_image */,
+ color);
+
+ for(int i = 0; i < num_draw_buffers; i++) {
+
+ /* Blit ms_fbo to singlesample FBO to resolve multisample
+ * buffer.
+ */
+ glBindFramebuffer(GL_READ_FRAMEBUFFER, ms_fbo.handle);
+ if(buffer_to_test == GL_COLOR_BUFFER_BIT)
+ glReadBuffer(GL_COLOR_ATTACHMENT0_EXT + i);
+
+ if ( is_buffer_zero_integer_format && !i)
+ glBindFramebuffer(GL_DRAW_FRAMEBUFFER,
+ resolve_int_fbo.handle);
+ else
+ glBindFramebuffer(GL_DRAW_FRAMEBUFFER,
+ resolve_fbo.handle);
+
+ /* Blit all the draw buffers to resolve_fbo / resolve_int_fbo
+ * with different y_offset.
+ */
+ unsigned y_offset = i * pattern_height;
+ glBlitFramebuffer(0, 0,
+ pattern_width, pattern_height,
+ 0, y_offset,
+ pattern_width, pattern_height + y_offset,
+ buffer_to_test, GL_NEAREST);
+
+ draw_image_to_window_system_fb(i /* draw_buffer_count */,
+ false /* rhs */);
+
+ /* Expected color values for all the draw buffers are computed
+ * to aid probe_framebuffer_color() in verification.
+ */
+ if(sample_alpha_to_coverage) {
+ /* Expected color is different for different draw
+ * buffers
+ */
+ compute_expected(sample_alpha_to_coverage,
+ sample_alpha_to_one,
+ i /* draw_buffer_count */);
+ }
+ }
+}
+
+void
+draw_reference_image(bool sample_alpha_to_coverage, bool sample_alpha_to_one)
+{
+ /* Draw test pattern in multisample ms_fbo with
+ * GL_SAMPLE_ALPHA_TO_COVERAGE disabled.
+ */
+ glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ms_fbo.handle);
+ glDrawBuffers(num_draw_buffers, draw_buffers);
+ ms_fbo.set_viewport();
+
+ if(sample_alpha_to_coverage) {
+ draw_pattern(sample_alpha_to_coverage,
+ sample_alpha_to_one,
+ true /* is_reference_image */,
+ color);
+ }
+ else {
+ /* Value of draw_buffer_count doesn't matter in this case */
+ compute_expected(sample_alpha_to_coverage,
+ sample_alpha_to_one,
+ 0 /* draw_buffer_count */);
+ draw_pattern(sample_alpha_to_coverage,
+ sample_alpha_to_one,
+ true /* is_reference_image */,
+ expected);
+ }
+
+ for(int i = 0; i < num_draw_buffers; i++) {
+
+ /* Blit ms_fbo to resolve_fbo to resolve multisample buffer */
+ glBindFramebuffer(GL_READ_FRAMEBUFFER, ms_fbo.handle);
+ glReadBuffer(GL_COLOR_ATTACHMENT0_EXT + i);
+ if (is_buffer_zero_integer_format && !i) {
+ glBindFramebuffer(GL_DRAW_FRAMEBUFFER,
+ resolve_int_fbo.handle);
+ }
+ else {
+ glBindFramebuffer(GL_DRAW_FRAMEBUFFER,
+ resolve_fbo.handle);
+ }
+
+ /* Blit all the draw buffers to resolve_fbo with different
+ * y_offset.
+ */
+ unsigned y_offset = i * pattern_height;
+ glBlitFramebuffer(0, 0,
+ pattern_width, pattern_height,
+ 0, y_offset,
+ pattern_width, pattern_height + y_offset,
+ buffer_to_test, GL_NEAREST);
+
+ draw_image_to_window_system_fb(i /* buffer_count */,
+ true /* rhs */ );
+ }
+}
+
+void
+ms_fbo_and_draw_buffers_setup(int samples,
+ int width,
+ int height,
+ int n_attachments,
+ GLenum test_buffer,
+ GLenum color_buffer_zero_format)
+{
+ int maxBuffers;
+ glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &maxBuffers);
+
+ /* Ensure that requested number of color attachments are
+ * supported by the implementation and fragment shader.
+ */
+ if (n_attachments <= (int) ARRAY_SIZE(draw_buffers) &&
+ n_attachments <= maxBuffers)
+ num_draw_buffers = n_attachments;
+ else {
+ printf("Number of attachments requested are not supported\n");
+ piglit_report_result(PIGLIT_SKIP);
+ }
+
+ pattern_width = width;
+ pattern_height = height;
+
+ /* Setup frame buffer objects with required configuration */
+ FboConfig ms_config(samples, pattern_width, pattern_height);
+ ms_config.color_internalformat = color_buffer_zero_format;
+ ms_fbo.setup(ms_config);
+
+ /* Create resolve_fbo with dimensions large enough to accomodate
+ * all the draw buffers
+ */
+ FboConfig resolve_config(0, pattern_width,
+ num_draw_buffers * pattern_height);
+ resolve_config.color_internalformat = GL_RGBA;
+ resolve_fbo.setup(resolve_config);
+
+ /* Create resolve_int_fbo to store downsampled integer draw buffer */
+ if (color_buffer_zero_format == GL_RGBA8I) {
+ resolve_config.color_internalformat = GL_RGBA8I;
+ /* Assuming single integer buffer */
+ resolve_config.height = pattern_height;
+ resolve_int_fbo.setup(resolve_config);
+ is_buffer_zero_integer_format = true;
+ }
+ else if (color_buffer_zero_format != GL_RGBA){
+ printf("Draw buffer zero format is not"
+ " supported by test functions.\n");
+ piglit_report_result(PIGLIT_FAIL);
+ }
+
+ if (!piglit_check_gl_error(GL_NO_ERROR)) {
+ printf("Error setting up frame buffer objects\n");
+ piglit_report_result(PIGLIT_FAIL);
+ }
+
+ /* Query the number of samples used in ms_fbo. OpenGL implementation
+ * may create FBO with more samples per pixel than what is requested.
+ */
+ glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ms_fbo.handle);
+ glGetIntegerv(GL_SAMPLES, &num_samples);
+
+ /* Attach additional color buffers to multisample FBO with default
+ * non-integer format (GL_RGBA.)
+ */
+ GLuint color_rb[num_draw_buffers - 1];
+ glGenRenderbuffers(num_draw_buffers - 1, color_rb);
+
+ for(int i = 0; i < num_draw_buffers - 1; i++) {
+ glBindRenderbuffer(GL_RENDERBUFFER, color_rb[i]);
+ glRenderbufferStorageMultisample(GL_RENDERBUFFER,
+ ms_fbo.config.num_samples,
+ GL_RGBA,
+ ms_fbo.config.width,
+ ms_fbo.config.height);
+
+ glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER,
+ GL_COLOR_ATTACHMENT0 + (i + 1),
+ GL_RENDERBUFFER,
+ color_rb[i]);
+ }
+
+ GLenum status = glCheckFramebufferStatus(GL_DRAW_FRAMEBUFFER);
+ if (status != GL_FRAMEBUFFER_COMPLETE) {
+ printf("Error attaching additional color buffers\n");
+ piglit_report_result(PIGLIT_FAIL);
+ }
+ buffer_to_test = test_buffer;
+}
diff --git a/tests/spec/ext_framebuffer_multisample/draw-buffers-common.h b/tests/spec/ext_framebuffer_multisample/draw-buffers-common.h
new file mode 100644
index 0000000..1060eeb
--- /dev/null
+++ b/tests/spec/ext_framebuffer_multisample/draw-buffers-common.h
@@ -0,0 +1,61 @@
+/* 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.
+ */
+
+#include "common.h"
+
+/**
+ * \file draw-buffers-common.h
+ * This file declares common functions which are used by multiple draw buffer
+ * test cases.
+ */
+
+/* Allocates all the relevant data arrays required in the test */
+void allocate_data_arrays(void);
+
+/* Draws a test pattern without sample_alpha_to_coverage and
+ * sample_alpha_to_one
+ */
+void draw_reference_image(bool sample_alpha_to_coverage,
+ bool sample_alpha_to_one);
+
+/* Draws the test pattern with either sample_alpha_to_coverage or
+ * sample_alpha_to_one enabled
+ */
+void draw_test_image(bool sample_alpha_to_coverage,
+ bool sample_alpha_to_one);
+
+/* Frees the previously allocated data arrays */
+void free_data_arrays(void);
+
+/* Initilaizes multisample framebuffer object with multiple draw buffers */
+void ms_fbo_and_draw_buffers_setup(int samples,
+ int width, int height,
+ int n_attachments,
+ GLenum test_buffers,
+ GLenum color_buffer_zero_format);
+
+/* Probe downsampled FBO (resolve_fbo / resolve_int_fbo) to compare against
+ * expected color for each draw buffer
+ */
+bool probe_framebuffer_color(void);
+
+void shader_compile(void);
--
1.7.7.6
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