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Some OpenGL cleanup

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This commit is contained in:
Clownacy 2019-07-31 22:48:37 +00:00
parent eb62a80956
commit 350ba46f2e
1 changed files with 18 additions and 15 deletions
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33
src/Backends/Rendering/OpenGL3.cpp
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@ -25,6 +25,12 @@ typedef struct Backend_Glyph
unsigned int height;
} Backend_Glyph;
typedef struct VertexBuffer
{
GLfloat vertexes[4][2];
GLfloat texture_coordinates[4][2];
} VertexBuffer;
static SDL_Window *window;
static SDL_GLContext context;
@ -39,11 +45,7 @@ static GLint program_glyph_uniform_colour;
static GLuint framebuffer_id;
static GLuint vertex_buffer_id;
static struct
{
GLfloat vertexes[4][2];
GLfloat texture_coordinates[4][2];
} vertex_buffer;
static VertexBuffer vertex_buffer;
static Backend_Surface framebuffer_surface;
@ -198,23 +200,28 @@ BOOL Backend_Init(SDL_Window *p_window)
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
// Set up VAO
// Set up Vertex Array Object
GLuint vertex_array_id;
glGenVertexArrays(1, &vertex_array_id);
glBindVertexArray(vertex_array_id);
// Set up VBO
// Set up Vertex Buffer Object
glGenBuffers(1, &vertex_buffer_id);
glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer_id);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_buffer), NULL, GL_DYNAMIC_DRAW);
// Set up IBO
// Set up Index Buffer Object
const GLuint indices[4] = {0, 1, 2, 3};
GLuint indices_buffer_id;
glGenBuffers(1, &indices_buffer_id);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indices_buffer_id);
GLuint index_buffer_id;
glGenBuffers(1, &index_buffer_id);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, index_buffer_id);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
// Set up the vertex attributes
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, (GLvoid*)offsetof(VertexBuffer, vertexes));
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 0, (GLvoid*)offsetof(VertexBuffer, texture_coordinates));
// Set up our shaders
program_texture = CompileShader(vertex_shader_texture, fragment_shader_texture);
program_texture_colour_key = CompileShader(vertex_shader_texture, fragment_shader_texture_colour_key);
@ -228,10 +235,6 @@ BOOL Backend_Init(SDL_Window *p_window)
program_colour_fill_uniform_colour = glGetUniformLocation(program_colour_fill, "colour");
program_glyph_uniform_colour = glGetUniformLocation(program_glyph, "colour");
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, 0);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 0, (GLvoid*)(sizeof(GLfloat) * 4 * 2));
// Set up framebuffer (used for surface-to-surface blitting)
glGenFramebuffers(1, &framebuffer_id);
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer_id);