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Convert triangle-opengl example to 3.3 core

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This commit is contained in:
Camilla Löwy 2019-05-19 20:59:10 +02:00
parent a639d6e635
commit e4aba7feaa
2 changed files with 22 additions and 11 deletions
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9
docs/quick.dox
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@ -135,9 +135,14 @@ require a minimum OpenGL version by setting the `GLFW_CONTEXT_VERSION_MAJOR` and
`GLFW_CONTEXT_VERSION_MINOR` hints _before_ creation. If the required minimum
version is not supported on the machine, context (and window) creation fails.
You can select the OpenGL profile by setting the `GLFW_OPENGL_PROFILE` hint.
This program uses the core profile as that is the only profile macOS supports
for OpenGL 3.x and 4.x.
@code
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
GLFWwindow* window = glfwCreateWindow(640, 480, "My Title", NULL, NULL);
if (!window)
{

24
examples/triangle-opengl.c
View File

@ -47,11 +47,11 @@ static const Vertex vertices[3] =
};
static const char* vertex_shader_text =
"#version 110\n"
"#version 330\n"
"uniform mat4 MVP;\n"
"attribute vec3 vCol;\n"
"attribute vec2 vPos;\n"
"varying vec3 color;\n"
"in vec3 vCol;\n"
"in vec2 vPos;\n"
"out vec3 color;\n"
"void main()\n"
"{\n"
" gl_Position = MVP * vec4(vPos, 0.0, 1.0);\n"
@ -59,11 +59,12 @@ static const char* vertex_shader_text =
"}\n";
static const char* fragment_shader_text =
"#version 110\n"
"varying vec3 color;\n"
"#version 330\n"
"in vec3 color;\n"
"out vec4 fragment;\n"
"void main()\n"
"{\n"
" gl_FragColor = vec4(color, 1.0);\n"
" fragment = vec4(color, 1.0);\n"
"}\n";
static void error_callback(int error, const char* description)
@ -84,8 +85,9 @@ int main(void)
if (!glfwInit())
exit(EXIT_FAILURE);
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
GLFWwindow* window = glfwCreateWindow(640, 480, "OpenGL Triangle", NULL, NULL);
if (!window)
@ -124,6 +126,9 @@ int main(void)
const GLint vpos_location = glGetAttribLocation(program, "vPos");
const GLint vcol_location = glGetAttribLocation(program, "vCol");
GLuint vertex_array;
glGenVertexArrays(1, &vertex_array);
glBindVertexArray(vertex_array);
glEnableVertexAttribArray(vpos_location);
glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE,
sizeof(Vertex), (void*) offsetof(Vertex, pos));
@ -148,6 +153,7 @@ int main(void)
glUseProgram(program);
glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat*) mvp);
glBindVertexArray(vertex_array);
glDrawArrays(GL_TRIANGLES, 0, 3);
glfwSwapBuffers(window);