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Convert msaa test to GL2
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parent
ac7b3e405c
commit
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116
tests/msaa.c
116
tests/msaa.c
@ -32,21 +32,48 @@
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#include <glad/glad.h>
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#include <GLFW/glfw3.h>
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#if defined(_MSC_VER)
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// Make MS math.h define M_PI
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#define _USE_MATH_DEFINES
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#endif
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#include "linmath.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include "getopt.h"
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static const struct
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{
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float x, y;
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} vertices[4] =
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{
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{ -0.6f, -0.6f },
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{ 0.6f, -0.6f },
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{ 0.6f, 0.6f },
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{ -0.6f, 0.6f }
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};
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static const char* vertex_shader_text =
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"uniform mat4 MVP;\n"
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"attribute vec2 vPos;\n"
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"void main()\n"
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"{\n"
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" gl_Position = MVP * vec4(vPos, 0.0, 1.0);\n"
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"}\n";
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static const char* fragment_shader_text =
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"void main()\n"
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"{\n"
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" gl_FragColor = vec4(1.0);\n"
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"}\n";
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static void error_callback(int error, const char* description)
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{
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fprintf(stderr, "Error: %s\n", description);
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}
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static void framebuffer_size_callback(GLFWwindow* window, int width, int height)
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{
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glViewport(0, 0, width, height);
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}
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static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
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{
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if (action != GLFW_PRESS)
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@ -69,6 +96,8 @@ int main(int argc, char** argv)
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{
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int ch, samples = 4;
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GLFWwindow* window;
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GLuint vertex_buffer, vertex_shader, fragment_shader, program;
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GLint mvp_location, vpos_location, vcol_location;
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while ((ch = getopt(argc, argv, "hs:")) != -1)
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{
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@ -97,7 +126,8 @@ int main(int argc, char** argv)
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printf("Requesting that MSAA not be available\n");
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glfwWindowHint(GLFW_SAMPLES, samples);
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glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
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window = glfwCreateWindow(800, 400, "Aliasing Detector", NULL, NULL);
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if (!window)
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@ -107,56 +137,80 @@ int main(int argc, char** argv)
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}
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glfwSetKeyCallback(window, key_callback);
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glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
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glfwMakeContextCurrent(window);
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gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
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glfwSwapInterval(1);
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if (!GLAD_GL_ARB_multisample && !GLAD_GL_VERSION_1_3)
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{
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printf("Multisampling is not supported\n");
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glfwTerminate();
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exit(EXIT_FAILURE);
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}
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glfwShowWindow(window);
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glGetIntegerv(GL_SAMPLES, &samples);
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if (samples)
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printf("Context reports MSAA is available with %i samples\n", samples);
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else
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printf("Context reports MSAA is unavailable\n");
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glMatrixMode(GL_PROJECTION);
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glOrtho(0.f, 1.f, 0.f, 0.5f, 0.f, 1.f);
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glMatrixMode(GL_MODELVIEW);
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glGenBuffers(1, &vertex_buffer);
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glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
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vertex_shader = glCreateShader(GL_VERTEX_SHADER);
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glShaderSource(vertex_shader, 1, &vertex_shader_text, NULL);
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glCompileShader(vertex_shader);
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fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
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glShaderSource(fragment_shader, 1, &fragment_shader_text, NULL);
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glCompileShader(fragment_shader);
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program = glCreateProgram();
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glAttachShader(program, vertex_shader);
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glAttachShader(program, fragment_shader);
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glLinkProgram(program);
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mvp_location = glGetUniformLocation(program, "MVP");
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vpos_location = glGetAttribLocation(program, "vPos");
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glEnableVertexAttribArray(vpos_location);
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glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE,
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sizeof(vertices[0]), (void*) 0);
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while (!glfwWindowShouldClose(window))
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{
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GLfloat time = (GLfloat) glfwGetTime();
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float ratio;
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int width, height;
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mat4x4 m, p, mvp;
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const double angle = glfwGetTime() * M_PI / 180.0;
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glfwGetFramebufferSize(window, &width, &height);
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ratio = width / (float) height;
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glViewport(0, 0, width, height);
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glClear(GL_COLOR_BUFFER_BIT);
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glLoadIdentity();
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glTranslatef(0.25f, 0.25f, 0.f);
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glRotatef(time, 0.f, 0.f, 1.f);
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glUseProgram(program);
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glDisable(GL_MULTISAMPLE_ARB);
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glRectf(-0.15f, -0.15f, 0.15f, 0.15f);
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mat4x4_ortho(p, -ratio, ratio, -1.f, 1.f, 0.f, 1.f);
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glLoadIdentity();
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glTranslatef(0.75f, 0.25f, 0.f);
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glRotatef(time, 0.f, 0.f, 1.f);
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mat4x4_translate(m, -1.f, 0.f, 0.f);
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mat4x4_rotate_Z(m, m, (float) angle);
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mat4x4_mul(mvp, p, m);
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glEnable(GL_MULTISAMPLE_ARB);
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glRectf(-0.15f, -0.15f, 0.15f, 0.15f);
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glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat*) mvp);
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glDisable(GL_MULTISAMPLE);
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glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
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mat4x4_translate(m, 1.f, 0.f, 0.f);
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mat4x4_rotate_Z(m, m, (float) angle);
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mat4x4_mul(mvp, p, m);
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glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat*) mvp);
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glEnable(GL_MULTISAMPLE);
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glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
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glfwSwapBuffers(window);
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glfwPollEvents();
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}
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glfwDestroyWindow(window);
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glfwTerminate();
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exit(EXIT_SUCCESS);
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}
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