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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <GLES2/gl2extchromium.h>
#include <math.h>
#include <stdint.h>
#include <vector>
#include "base/containers/contains.h"
#include "base/strings/string_number_conversions.h"
#include "gpu/command_buffer/client/gles2_implementation.h"
#include "gpu/command_buffer/client/shared_memory_limits.h"
#include "gpu/command_buffer/tests/gl_manager.h"
#include "gpu/command_buffer/tests/gl_test_utils.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace gpu {
class GLWebGLMultiDrawTest : public ::testing::Test {
protected:
GLWebGLMultiDrawTest() : max_transfer_buffer_size_(16 * 1024) {
size_t vertex_bytes_per_pixel = sizeof(GLint) + sizeof(GLsizei);
uint32_t pixel_count = max_transfer_buffer_size_ / vertex_bytes_per_pixel;
canvas_size_ = 2 * static_cast<uint32_t>(std::sqrt(pixel_count));
}
void SetUp() override {
GLManager::Options options;
options.shared_memory_limits.min_transfer_buffer_size =
max_transfer_buffer_size_ / 2;
options.shared_memory_limits.max_transfer_buffer_size =
max_transfer_buffer_size_;
options.shared_memory_limits.start_transfer_buffer_size =
max_transfer_buffer_size_ / 2;
options.context_type = CONTEXT_TYPE_WEBGL1;
options.size = gfx::Size(canvas_size_, canvas_size_);
gl_.Initialize(options);
}
void TearDown() override { gl_.Destroy(); }
uint32_t canvas_size() const { return canvas_size_; }
uint32_t max_transfer_buffer_size() const {
return max_transfer_buffer_size_;
}
gles2::GLES2Implementation* gles2_implementation() const {
return gl_.gles2_implementation();
}
private:
GLManager gl_;
uint32_t canvas_size_;
uint32_t max_transfer_buffer_size_;
};
// This test issues a MultiDrawArrays that requires more command space than
// the maximum size of the transfer buffer. To check that every draw is issued,
// each gl_DrawID is transformed to a unique pixel and colored a unique value.
// The pixels are read back and checked that every pixel is correct.
TEST_F(GLWebGLMultiDrawTest, MultiDrawLargerThanTransferBuffer) {
std::string requestable_extensions_string =
reinterpret_cast<const char*>(glGetRequestableExtensionsCHROMIUM());
// This test is only valid if the multi draw extension is supported
if (!GLTestHelper::HasExtension("GL_ANGLE_multi_draw")) {
if (!base::Contains(requestable_extensions_string,
"GL_ANGLE_multi_draw ")) {
return;
}
glRequestExtensionCHROMIUM("GL_ANGLE_multi_draw");
}
if (!GLTestHelper::HasExtension("GL_WEBGL_multi_draw")) {
if (!base::Contains(requestable_extensions_string,
"GL_WEBGL_multi_draw ")) {
return;
}
glRequestExtensionCHROMIUM("GL_WEBGL_multi_draw");
}
std::string vertex_source =
"#define SIZE " + base::NumberToString(canvas_size()) + "\n";
vertex_source += "#extension GL_ANGLE_multi_draw : require\n";
vertex_source += R"(
attribute vec2 a_position;
varying vec4 v_color;
int mod(int x, int y) {
int q = x / y;
return x - q * y;
}
int rshift8(int x) {
int result = x;
for (int i = 0; i < 8; ++i) {
result = result / 2;
}
return result;
}
int rshift16(int x) {
int result = x;
for (int i = 0; i < 16; ++i) {
result = result / 2;
}
return result;
}
int rshift24(int x) {
int result = x;
for (int i = 0; i < 24; ++i) {
result = result / 2;
}
return result;
}
void main() {
int x_int = mod(gl_DrawID, SIZE);
int y_int = gl_DrawID / SIZE;
float s = 1.0 / float(SIZE);
float x = float(x_int) / float(SIZE);
float y = float(y_int) / float(SIZE);
float z = 0.0;
mat4 m = mat4(s, 0, 0, 0, 0, s, 0, 0, 0, 0, s, 0, x, y, z, 1);
vec2 position01 = a_position * 0.5 + 0.5;
gl_Position = (m * vec4(position01, 0.0, 1.0)) * 2.0 - 1.0;
int r = mod(rshift24(gl_DrawID), 256);
int g = mod(rshift16(gl_DrawID), 256);
int b = mod(rshift8(gl_DrawID), 256);
int a = mod(gl_DrawID, 256);
float denom = 1.0 / 255.0;
v_color = vec4(r, g, b, a) * denom;
})";
GLuint program = GLTestHelper::LoadProgram(vertex_source.c_str(), R"(
precision mediump float;
varying vec4 v_color;
void main() { gl_FragColor = v_color; }
)");
ASSERT_NE(program, 0u);
GLint position_loc = glGetAttribLocation(program, "a_position");
ASSERT_NE(position_loc, -1);
glUseProgram(program);
GLuint vbo = GLTestHelper::SetupUnitQuad(position_loc);
ASSERT_NE(vbo, 0u);
std::vector<GLint> firsts(canvas_size() * canvas_size(), 0);
std::vector<GLsizei> counts(canvas_size() * canvas_size(), 6);
ASSERT_GT(firsts.size() * sizeof(GLint) + counts.size() * sizeof(GLsizei),
max_transfer_buffer_size());
glClearColor(0, 0, 0, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
gles2_implementation()->MultiDrawArraysWEBGL(GL_TRIANGLES, firsts.data(),
counts.data(),
canvas_size() * canvas_size());
glFlush();
std::vector<std::array<uint8_t, 4>> pixels(canvas_size() * canvas_size());
glReadPixels(0, 0, canvas_size(), canvas_size(), GL_RGBA, GL_UNSIGNED_BYTE,
pixels.data());
unsigned int expected = 0;
for (const auto& pixel : pixels) {
unsigned int id =
((pixel[0] << 24) + (pixel[1] << 16) + (pixel[2] << 8) + pixel[3]);
EXPECT_EQ(id, expected);
expected++;
}
GLTestHelper::CheckGLError(
"GLWebGLMultiDrawTest.MultiDrawLargerThanTransferBuffer", __LINE__);
}
} // namespace gpu
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