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Convert msaa test to GL2

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This commit is contained in:
Camilla Berglund 2016-08-21 23:37:49 +02:00
parent ac7b3e405c
commit 9f60cd18e3
1 changed files with 85 additions and 31 deletions
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116
tests/msaa.c
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@ -32,21 +32,48 @@
#include <glad/glad.h>
#include <GLFW/glfw3.h>
#if defined(_MSC_VER)
// Make MS math.h define M_PI
#define _USE_MATH_DEFINES
#endif
#include "linmath.h"
#include <stdio.h>
#include <stdlib.h>
#include "getopt.h"
static const struct
{
float x, y;
} vertices[4] =
{
{ -0.6f, -0.6f },
{ 0.6f, -0.6f },
{ 0.6f, 0.6f },
{ -0.6f, 0.6f }
};
static const char* vertex_shader_text =
"uniform mat4 MVP;\n"
"attribute vec2 vPos;\n"
"void main()\n"
"{\n"
" gl_Position = MVP * vec4(vPos, 0.0, 1.0);\n"
"}\n";
static const char* fragment_shader_text =
"void main()\n"
"{\n"
" gl_FragColor = vec4(1.0);\n"
"}\n";
static void error_callback(int error, const char* description)
{
fprintf(stderr, "Error: %s\n", description);
}
static void framebuffer_size_callback(GLFWwindow* window, int width, int height)
{
glViewport(0, 0, width, height);
}
static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
{
if (action != GLFW_PRESS)
@ -69,6 +96,8 @@ int main(int argc, char** argv)
{
int ch, samples = 4;
GLFWwindow* window;
GLuint vertex_buffer, vertex_shader, fragment_shader, program;
GLint mvp_location, vpos_location, vcol_location;
while ((ch = getopt(argc, argv, "hs:")) != -1)
{
@ -97,7 +126,8 @@ int main(int argc, char** argv)
printf("Requesting that MSAA not be available\n");
glfwWindowHint(GLFW_SAMPLES, samples);
glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
window = glfwCreateWindow(800, 400, "Aliasing Detector", NULL, NULL);
if (!window)
@ -107,56 +137,80 @@ int main(int argc, char** argv)
}
glfwSetKeyCallback(window, key_callback);
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
glfwMakeContextCurrent(window);
gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
glfwSwapInterval(1);
if (!GLAD_GL_ARB_multisample && !GLAD_GL_VERSION_1_3)
{
printf("Multisampling is not supported\n");
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwShowWindow(window);
glGetIntegerv(GL_SAMPLES, &samples);
if (samples)
printf("Context reports MSAA is available with %i samples\n", samples);
else
printf("Context reports MSAA is unavailable\n");
glMatrixMode(GL_PROJECTION);
glOrtho(0.f, 1.f, 0.f, 0.5f, 0.f, 1.f);
glMatrixMode(GL_MODELVIEW);
glGenBuffers(1, &vertex_buffer);
glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
vertex_shader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertex_shader, 1, &vertex_shader_text, NULL);
glCompileShader(vertex_shader);
fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragment_shader, 1, &fragment_shader_text, NULL);
glCompileShader(fragment_shader);
program = glCreateProgram();
glAttachShader(program, vertex_shader);
glAttachShader(program, fragment_shader);
glLinkProgram(program);
mvp_location = glGetUniformLocation(program, "MVP");
vpos_location = glGetAttribLocation(program, "vPos");
glEnableVertexAttribArray(vpos_location);
glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE,
sizeof(vertices[0]), (void*) 0);
while (!glfwWindowShouldClose(window))
{
GLfloat time = (GLfloat) glfwGetTime();
float ratio;
int width, height;
mat4x4 m, p, mvp;
const double angle = glfwGetTime() * M_PI / 180.0;
glfwGetFramebufferSize(window, &width, &height);
ratio = width / (float) height;
glViewport(0, 0, width, height);
glClear(GL_COLOR_BUFFER_BIT);
glLoadIdentity();
glTranslatef(0.25f, 0.25f, 0.f);
glRotatef(time, 0.f, 0.f, 1.f);
glUseProgram(program);
glDisable(GL_MULTISAMPLE_ARB);
glRectf(-0.15f, -0.15f, 0.15f, 0.15f);
mat4x4_ortho(p, -ratio, ratio, -1.f, 1.f, 0.f, 1.f);
glLoadIdentity();
glTranslatef(0.75f, 0.25f, 0.f);
glRotatef(time, 0.f, 0.f, 1.f);
mat4x4_translate(m, -1.f, 0.f, 0.f);
mat4x4_rotate_Z(m, m, (float) angle);
mat4x4_mul(mvp, p, m);
glEnable(GL_MULTISAMPLE_ARB);
glRectf(-0.15f, -0.15f, 0.15f, 0.15f);
glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat*) mvp);
glDisable(GL_MULTISAMPLE);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
mat4x4_translate(m, 1.f, 0.f, 0.f);
mat4x4_rotate_Z(m, m, (float) angle);
mat4x4_mul(mvp, p, m);
glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat*) mvp);
glEnable(GL_MULTISAMPLE);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
glfwSwapBuffers(window);
glfwPollEvents();
}
glfwDestroyWindow(window);
glfwTerminate();
exit(EXIT_SUCCESS);
}