Implemented immediate mode renderer for debug drawing and drawing arbitrary points, lines and triangles
Shariq Shah
8 years ago
parent
6728ac5f8c
commit
8782bf27ac
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//include version.glsl |
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in vec4 color; |
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out vec4 frag_color; |
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void main() |
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{ |
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frag_color = color; |
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} |
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//include version.glsl |
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uniform mat4 mvp; |
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in vec3 vPosition; |
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in vec4 vColor; |
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out vec4 color; |
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void main() |
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{ |
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gl_Position = mvp * vec4(vPosition, 1.0); |
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color = vColor; |
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} |
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#include "im_render.h" |
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#include "entity.h" |
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#include "camera.h" |
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#include "gl_load.h" |
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#include "../common/array.h" |
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#include "../common/num_types.h" |
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#include "shader.h" |
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#include "../common/log.h" |
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#define MAX_IM_VERTICES 4096 |
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#define MAX_IM_GEOMETRIES (MAX_IM_VERTICES / 2) |
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static struct |
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{ |
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struct IM_Vertex vertices[MAX_IM_VERTICES]; |
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struct IM_Geom geometries[MAX_IM_GEOMETRIES]; |
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uint vao; |
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uint vbo; |
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int im_shader; |
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int curr_geom; |
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int curr_vertex; |
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vec4 default_color; |
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} |
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IM_State; |
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static struct IM_Geom* active_geom = NULL; |
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static vec4 active_vertex_color = { 0.f, 0.f, 0.f, 0.f }; |
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void im_init(void) |
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{ |
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glGenVertexArrays(1, &IM_State.vao); |
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glBindVertexArray(IM_State.vao); |
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glGenBuffers(1, &IM_State.vbo); |
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glBindBuffer(GL_ARRAY_BUFFER, IM_State.vbo); |
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GL_CHECK(glBufferData(GL_ARRAY_BUFFER, sizeof(struct IM_Vertex) * MAX_IM_VERTICES, NULL, GL_STREAM_DRAW)); |
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//Position
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GL_CHECK(glVertexAttribPointer(ATTRIB_LOC_POSITION, 3, GL_FLOAT, GL_FALSE, sizeof(struct IM_Vertex), 0)); |
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GL_CHECK(glEnableVertexAttribArray(ATTRIB_LOC_POSITION)); |
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//Color
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GL_CHECK(glVertexAttribPointer(ATTRIB_LOC_COLOR, 4, GL_FLOAT, GL_FALSE, sizeof(struct IM_Vertex), sizeof(vec3))); |
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GL_CHECK(glEnableVertexAttribArray(ATTRIB_LOC_COLOR)); |
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glBindBuffer(GL_ARRAY_BUFFER, 0); |
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glBindVertexArray(0); |
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memset(&IM_State.geometries[0], 0, sizeof(struct IM_Geom) * MAX_IM_GEOMETRIES); |
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memset(&IM_State.vertices[0], 0, sizeof(struct IM_Vertex) * MAX_IM_VERTICES); |
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IM_State.curr_geom = -1; |
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IM_State.curr_vertex = 0; |
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vec4_fill(&IM_State.default_color, 1.f, 0.f, 1.f, 1.f); |
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vec4_assign(&active_vertex_color, &IM_State.default_color); |
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IM_State.im_shader = shader_create("im_geom.vert", "im_geom.frag"); |
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} |
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void im_cleanup(void) |
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{ |
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shader_remove(IM_State.im_shader); |
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glDeleteBuffers(1, &IM_State.vbo); |
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glDeleteVertexArrays(1, &IM_State.vao); |
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memset(&IM_State.geometries[0], 0, sizeof(struct IM_Geom) * MAX_IM_GEOMETRIES); |
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memset(&IM_State.vertices[0], 0, sizeof(struct IM_Vertex) * MAX_IM_VERTICES); |
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IM_State.vao = 0; |
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IM_State.vbo = 0; |
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IM_State.curr_geom = -1; |
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IM_State.curr_vertex = 0; |
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IM_State.im_shader = -1; |
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} |
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void im_begin(vec3 position, quat rotation, vec3 scale, int draw_mode) |
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{ |
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if(active_geom) |
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{ |
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log_error("im_begin", "im_begin called before im_end"); |
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return; |
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} |
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IM_State.curr_geom++; |
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active_geom = &IM_State.geometries[IM_State.curr_geom]; |
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active_geom->start_index = IM_State.curr_vertex; |
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active_geom->draw_mode = draw_mode; |
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vec3_assign(&active_geom->position, &position); |
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vec3_assign(&active_geom->scale, &scale); |
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quat_assign(&active_geom->rotation, &rotation); |
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} |
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void im_pos(float x, float y, float z) |
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{ |
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vec3_fill(&IM_State.vertices[IM_State.curr_vertex].position, x, y, z); |
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vec4_assign(&IM_State.vertices[IM_State.curr_vertex].color, &active_vertex_color); |
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IM_State.curr_vertex++; |
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} |
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void im_color(float r, float g, float b, float a) |
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{ |
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vec4_fill(&active_vertex_color, r, g, b, a); |
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} |
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void im_end(void) |
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{ |
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active_geom->num_vertices = IM_State.curr_vertex - active_geom->start_index; |
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glBindBuffer(GL_ARRAY_BUFFER, IM_State.vbo); |
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glBufferSubData(GL_ARRAY_BUFFER, |
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sizeof(struct IM_Vertex) * active_geom->start_index, |
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sizeof(struct IM_Vertex) * active_geom->num_vertices, |
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&IM_State.vertices[active_geom->start_index]); |
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renderer_check_glerror("sprite_batch_end:glBufferSubData"); |
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glBindBuffer(GL_ARRAY_BUFFER, 0); |
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active_geom = NULL; |
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vec4_assign(&active_vertex_color, &IM_State.default_color); |
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} |
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void im_render(struct Entity* active_viewer) |
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{ |
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if(IM_State.curr_geom == -1) |
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return; |
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shader_bind(IM_State.im_shader); |
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{ |
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static mat4 mvp, translation, rotation, scale; |
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glBindVertexArray(IM_State.vao); |
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for(int i = 0; i <= IM_State.curr_geom; i++) |
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{ |
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struct IM_Geom* geom = &IM_State.geometries[i]; |
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mat4_identity(&mvp); |
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mat4_identity(&scale); |
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mat4_identity(&translation); |
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mat4_identity(&rotation); |
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mat4_scale(&scale, geom->scale.x, geom->scale.y, geom->scale.z); |
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mat4_translate(&translation, geom->position.x, geom->position.y, geom->position.z); |
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mat4_from_quat(&rotation, &geom->rotation); |
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mat4_mul(&mvp, &mvp, &translation); |
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mat4_mul(&mvp, &mvp, &rotation); |
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mat4_mul(&mvp, &mvp, &scale); |
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mat4_mul(&mvp, &active_viewer->camera.view_proj_mat, &mvp); |
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shader_set_uniform_mat4(IM_State.im_shader, "mvp", &mvp); |
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glDrawArrays(geom->draw_mode, geom->start_index, geom->num_vertices); |
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} |
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glBindVertexArray(0); |
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} |
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shader_unbind(); |
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IM_State.curr_geom = -1; |
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IM_State.curr_vertex = 0; |
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} |
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@ -0,0 +1,32 @@ |
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#ifndef IM_RENDER_H |
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#define IM_RENDER_H |
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#include "../common/linmath.h" |
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struct IM_Vertex |
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{ |
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vec3 position; |
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vec4 color; |
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}; |
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struct IM_Geom |
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{ |
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vec3 position; |
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quat rotation; |
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vec3 scale; |
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int start_index; |
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int num_vertices; |
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int draw_mode; |
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}; |
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struct Entity; |
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void im_init(void); |
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void im_cleanup(void); |
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void im_begin(vec3 position, quat rotation, vec3 scale, int draw_mode); |
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void im_pos(float x, float y, float z); |
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void im_color(float r, float g, float b, float a); // set active color
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void im_end(void); |
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void im_render(struct Entity* active_viewer); |
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#endif |
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