comparison: src/primitives.c
src/primitives.c
- changeset 81
- 84a546e282b7
- parent 65
- 9c44c55d327a
- child 82
- 4e1e698f4b0d
equal
deleted
inserted
replaced
| 80:9f7bfc0a1dc3 | 81:84a546e282b7 |
|---|---|
| 27 | 27 |
| 28 #include "ascension/primitives.h" | 28 #include "ascension/primitives.h" |
| 29 #include "ascension/error.h" | 29 #include "ascension/error.h" |
| 30 #include "ascension/context.h" | 30 #include "ascension/context.h" |
| 31 | 31 |
| 32 #include <string.h> | |
| 33 #include <GL/glew.h> | 32 #include <GL/glew.h> |
| 34 | 33 |
| 35 static void asc_primitives_init_plane(AscMesh *mesh) { | 34 void asc_primitives_init_plane(AscMesh *mesh) { |
| 36 asc_dprintf("Create primitive plane in VBO %u and VAO %u", mesh->vbo, mesh->vao); | 35 if (mesh->vbo == 0) { |
| 36 if (mesh->vao > 0) { | |
| 37 asc_dprintf("!!! Mesh with VAO %u has no VBO - this is most likely a programming error !!!", mesh->vao); | |
| 38 } | |
| 39 asc_mesh_allocate_buffers(mesh, 1); | |
| 40 } | |
| 41 asc_dprintf("Create plane in VBO %u and VAO %u", mesh->vbo, mesh->vao); | |
| 37 mesh->vertices = 4; | 42 mesh->vertices = 4; |
| 38 float data[8] = { | 43 float data[8] = { |
| 39 0.0f, 0.0f, // bottom left | 44 0.0f, 0.0f, // bottom left |
| 40 0.0f, 1.0f, // top left | 45 0.0f, 1.0f, // top left |
| 41 1.0f, 0.0f, // bottom right | 46 1.0f, 0.0f, // bottom right |
| 46 glBindVertexArray(mesh->vao); | 51 glBindVertexArray(mesh->vao); |
| 47 glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, NULL); | 52 glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, NULL); |
| 48 glEnableVertexAttribArray(0); | 53 glEnableVertexAttribArray(0); |
| 49 } | 54 } |
| 50 | 55 |
| 51 bool asc_primitives_init(AscPrimitives *primitives) { | |
| 52 asc_dprintf("Create primitives for the GL context of active window."); | |
| 53 // TODO: more primitives | |
| 54 | |
| 55 GLuint buffers[1]; | |
| 56 GLuint arrays[1]; | |
| 57 glGenBuffers(1, buffers); | |
| 58 glGenVertexArrays(1, arrays); | |
| 59 | |
| 60 AscMesh *plane = &(primitives->plane); | |
| 61 plane->vbo = buffers[0]; | |
| 62 plane->vao = arrays[0]; | |
| 63 asc_primitives_init_plane(plane); | |
| 64 | |
| 65 GLenum error = glGetError(); | |
| 66 if (error == GL_NO_ERROR) { | |
| 67 return true; | |
| 68 } else { | |
| 69 asc_error_gl(error, CX_STR("Initialization of primitive meshes failed.")); | |
| 70 return false; | |
| 71 } | |
| 72 } | |
| 73 | |
| 74 void asc_primitives_destroy(AscPrimitives *primitives) { | |
| 75 asc_dprintf("Destroy primitives in GL context of active window."); | |
| 76 | |
| 77 GLuint buffers[1]; | |
| 78 GLuint arrays[1]; | |
| 79 | |
| 80 buffers[0] = primitives->plane.vbo; | |
| 81 arrays[0] = primitives->plane.vao; | |
| 82 | |
| 83 glDeleteBuffers(1, buffers); | |
| 84 glDeleteVertexArrays(1, arrays); | |
| 85 | |
| 86 memset(primitives, 0, sizeof(AscPrimitives)); | |
| 87 } | |
| 88 | |
| 89 void asc_primitives_draw_plane(void) { | 56 void asc_primitives_draw_plane(void) { |
| 90 AscMesh const *mesh = &(asc_active_window->glctx.primitives.plane); | 57 AscMesh const *mesh = &(asc_active_window->glctx.primitives.plane); |
| 91 glBindVertexArray(mesh->vao); | 58 glBindVertexArray(mesh->vao); |
| 92 glDrawArrays(GL_TRIANGLE_STRIP, 0, mesh->vertices); | 59 glDrawArrays(GL_TRIANGLE_STRIP, 0, mesh->vertices); |
| 93 } | 60 } |
