90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
#include "twn_draw_c.h"
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#include "twn_engine_context_c.h"
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#include "twn_util.h"
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#ifdef EMSCRIPTEN
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#include <GLES2/gl2.h>
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#else
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#include <glad/glad.h>
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#endif
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void setup_viewport(int x, int y, int width, int height) {
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glViewport(x, y, width, height);
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}
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VertexBuffer create_vertex_buffer(void) {
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GLuint result;
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glGenBuffers(1, &result);
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return result;
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}
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void delete_vertex_buffer(VertexBuffer buffer) {
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glDeleteBuffers(1, &buffer);
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}
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void specify_vertex_buffer(VertexBuffer buffer, void *data, size_t bytes) {
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glBindBuffer(GL_ARRAY_BUFFER, buffer);
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glBufferData(GL_ARRAY_BUFFER, bytes, data, GL_STREAM_DRAW);
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}
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void bind_quad_element_buffer(void) {
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static GLuint buffer = 0;
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/* it's only generated once at runtime */
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if (buffer == 0) {
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glGenBuffers(1, &buffer);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffer);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER,
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QUAD_ELEMENT_BUFFER_LENGTH * 6 * sizeof(uint16_t),
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NULL,
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GL_STATIC_DRAW);
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uint16_t *const indices = glMapBuffer(GL_ELEMENT_ARRAY_BUFFER,
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GL_WRITE_ONLY);
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if (!indices)
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CRY("Quad indices generation", "glMapBuffer() failed");
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for (uint16_t i = 0; i < QUAD_ELEMENT_BUFFER_LENGTH; ++i) {
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indices[i * 6 + 0] = (uint16_t)(i * 4 + 0);
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indices[i * 6 + 1] = (uint16_t)(i * 4 + 1);
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indices[i * 6 + 2] = (uint16_t)(i * 4 + 2);
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indices[i * 6 + 3] = (uint16_t)(i * 4 + 2);
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indices[i * 6 + 4] = (uint16_t)(i * 4 + 3);
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indices[i * 6 + 5] = (uint16_t)(i * 4 + 0);
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}
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glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
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} else
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffer);
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}
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void clear_draw_buffer(void) {
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glClearColor((1.0f / 255) * 230,
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(1.0f / 255) * 230,
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(1.0f / 255) * 230, 1);
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/* TODO: don't clear color when skybox is applied? */
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/* for that window should match framebuffer */
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/* also it is driver dependent, from what i can gather */
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glClear(GL_COLOR_BUFFER_BIT |
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GL_DEPTH_BUFFER_BIT |
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GL_STENCIL_BUFFER_BIT);
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}
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void swap_buffers(void) {
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SDL_GL_SwapWindow(ctx.window);
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}
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void set_depth_range(double low, double high) {
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glDepthRange(low, high);
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}
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