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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// 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 "gpu/command_buffer/tests/gl_manager.h"
#include "gpu/command_buffer/tests/gl_test_utils.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#define SHADER(Src) #Src
namespace gpu {
class PointCoordTest : public testing::Test {
public:
static const GLsizei kResolution = 256;
protected:
virtual void SetUp() {
GLManager::Options options;
options.size = gfx::Size(kResolution, kResolution);
gl_.Initialize(options);
}
virtual void TearDown() {
gl_.Destroy();
}
GLuint SetupQuad(GLint position_location, GLfloat pixel_offset);
GLManager gl_;
};
GLuint PointCoordTest::SetupQuad(
GLint position_location, GLfloat pixel_offset) {
GLuint vbo = 0;
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
float vertices[] = {
-0.5 + pixel_offset, -0.5 + pixel_offset,
0.5 + pixel_offset, -0.5 + pixel_offset,
-0.5 + pixel_offset, 0.5 + pixel_offset,
0.5 + pixel_offset, 0.5 + pixel_offset,
};
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(position_location);
glVertexAttribPointer(position_location, 2, GL_FLOAT, GL_FALSE, 0, 0);
return vbo;
}
namespace {
struct FormatType {
GLenum format;
GLenum type;
};
GLfloat s2p(GLfloat s) {
return (s + 1.0) * 0.5 * PointCoordTest::kResolution;
}
} // anonymous namespace
// crbug.com/162976
// Flaky on Linux ATI bot.
#if (defined(OS_LINUX) && defined(NDEBUG))
#define MAYBE_RenderTo FAILS_RenderTo
#else
#define MAYBE_RenderTo RenderTo
#endif
TEST_F(PointCoordTest, MAYBE_RenderTo) {
static const char* v_shader_str = SHADER(
attribute vec4 a_position;
uniform float u_pointsize;
void main()
{
gl_PointSize = u_pointsize;
gl_Position = a_position;
}
);
static const char* f_shader_str = SHADER(
precision mediump float;
void main()
{
gl_FragColor = vec4(
gl_PointCoord.x,
gl_PointCoord.y,
0,
1);
}
);
GLuint program = GLTestHelper::LoadProgram(v_shader_str, f_shader_str);
glUseProgram(program);
GLint position_loc = glGetAttribLocation(program, "a_position");
GLint pointsize_loc = glGetUniformLocation(program, "u_pointsize");
GLint range[2] = { 0, };
glGetIntegerv(GL_ALIASED_POINT_SIZE_RANGE, &range[0]);
GLint max_point_size = range[1];
EXPECT_GE(max_point_size, 1);
max_point_size = std::min(max_point_size, 64);
GLint point_width = max_point_size / kResolution;
GLint point_step = max_point_size / 4;
point_step = std::max(1, point_step);
glUniform1f(pointsize_loc, max_point_size);
GLfloat pixel_offset = (max_point_size % 2) ? (1.0f / kResolution) : 0;
SetupQuad(position_loc, pixel_offset);
glClear(GL_COLOR_BUFFER_BIT);
glDrawArrays(GL_POINTS, 0, 4);
for (GLint py = 0; py < 2; ++py) {
for (GLint px = 0; px < 2; ++px) {
GLfloat point_x = -0.5 + px + pixel_offset;
GLfloat point_y = -0.5 + py + pixel_offset;
for (GLint yy = 0; yy < max_point_size; yy += point_step) {
for (GLint xx = 0; xx < max_point_size; xx += point_step) {
// formula for s and t from OpenGL ES 2.0 spec section 3.3
GLfloat xw = s2p(point_x);
GLfloat yw = s2p(point_y);
GLfloat u = xx / max_point_size * 2 - 1;
GLfloat v = yy / max_point_size * 2 - 1;
GLint xf = s2p(point_x + u * point_width);
GLint yf = s2p(point_y + v * point_width);
GLfloat s = 0.5 + (xf + 0.5 - xw) / max_point_size;
GLfloat t = 0.5 + (yf + 0.5 - yw) / max_point_size;
uint8 color[4] = {
s * 255,
(1 - t) * 255,
0,
255,
};
GLTestHelper::CheckPixels(xf, yf, 1, 1, 4, color);
}
}
}
}
GLTestHelper::CheckGLError("no errors", __LINE__);
}
} // namespace gpu
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