add OpenGL 2.0 and 3.3 Core renderers
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headshot2017
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#include "gl20_renderer.h"
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#include <stdio.h>
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#include "../../src/libsm64.h"
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#include "../renderer.h"
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#include "../context.h"
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#include "../level.h"
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#include <GL/glu.h>
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static void load_collision_mesh( CollisionMesh *mesh )
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{
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mesh->num_vertices = 3 * surfaces_count;
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mesh->position = malloc( sizeof( float ) * surfaces_count * 9 );
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mesh->normal = malloc( sizeof( float ) * surfaces_count * 9 );
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mesh->color = malloc( sizeof( float ) * surfaces_count * 9 );
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mesh->index = malloc( sizeof( uint16_t ) * surfaces_count * 3 );
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for( size_t i = 0; i < surfaces_count; ++i )
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{
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const struct SM64Surface *surf = &surfaces[i];
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float x1 = mesh->position[9*i+0] = surf->vertices[0][0];
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float y1 = mesh->position[9*i+1] = surf->vertices[0][1];
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float z1 = mesh->position[9*i+2] = surf->vertices[0][2];
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float x2 = mesh->position[9*i+3] = surf->vertices[1][0];
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float y2 = mesh->position[9*i+4] = surf->vertices[1][1];
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float z2 = mesh->position[9*i+5] = surf->vertices[1][2];
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float x3 = mesh->position[9*i+6] = surf->vertices[2][0];
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float y3 = mesh->position[9*i+7] = surf->vertices[2][1];
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float z3 = mesh->position[9*i+8] = surf->vertices[2][2];
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float nx = (y2 - y1) * (z3 - z2) - (z2 - z1) * (y3 - y2);
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float ny = (z2 - z1) * (x3 - x2) - (x2 - x1) * (z3 - z2);
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float nz = (x2 - x1) * (y3 - y2) - (y2 - y1) * (x3 - x2);
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float mag = sqrtf(nx * nx + ny * ny + nz * nz);
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nx /= mag;
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ny /= mag;
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nz /= mag;
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mesh->normal[9*i+0] = nx;
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mesh->normal[9*i+1] = ny;
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mesh->normal[9*i+2] = nz;
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mesh->normal[9*i+3] = nx;
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mesh->normal[9*i+4] = ny;
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mesh->normal[9*i+5] = nz;
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mesh->normal[9*i+6] = nx;
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mesh->normal[9*i+7] = ny;
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mesh->normal[9*i+8] = nz;
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for (int j=0; j<9; j++)
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mesh->color[9*i+j] = (0.5 + 0.25 * 1) * (.5+.5*mesh->normal[9*i+j]);
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mesh->index[3*i+0] = 3*i+0;
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mesh->index[3*i+1] = 3*i+1;
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mesh->index[3*i+2] = 3*i+2;
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}
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}
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static void load_mario_mesh( MarioMesh *mesh, struct SM64MarioGeometryBuffers *marioGeo )
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{
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mesh->index = malloc( 3 * SM64_GEO_MAX_TRIANGLES * sizeof(uint16_t) );
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for( int i = 0; i < 3 * SM64_GEO_MAX_TRIANGLES; ++i )
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mesh->index[i] = i;
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mesh->num_vertices = 3 * SM64_GEO_MAX_TRIANGLES;
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}
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static void update_mario_mesh( MarioMesh *mesh, struct SM64MarioGeometryBuffers *marioGeo )
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{
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if( mesh->index == NULL )
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load_mario_mesh( mesh, marioGeo );
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mesh->num_vertices = 3 * marioGeo->numTrianglesUsed;
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glEnableClientState(GL_VERTEX_ARRAY);
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glEnableClientState(GL_NORMAL_ARRAY);
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glEnableClientState(GL_COLOR_ARRAY);
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glEnableClientState(GL_TEXTURE_COORD_ARRAY);
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glVertexPointer(3, GL_FLOAT, 0, marioGeo->position);
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glNormalPointer(GL_FLOAT, 0, marioGeo->normal);
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glColorPointer(3, GL_FLOAT, 0, marioGeo->color);
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glTexCoordPointer(2, GL_FLOAT, 0, marioGeo->uv);
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}
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static void gl20_init(RenderState *renderState, uint8_t *marioTexture)
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{
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load_collision_mesh( &renderState->collision );
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glEnable( GL_CULL_FACE );
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glCullFace( GL_BACK );
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glClearColor( 0.2f, 0.2f, 0.2f, 1.0f );
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glDepthMask( GL_TRUE );
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glDepthFunc( GL_LEQUAL );
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glEnable( GL_DEPTH_TEST );
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glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
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glEnable( GL_BLEND );
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glColor4f(1,1,1,1);
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glGenTextures( 1, &renderState->mario_texture );
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glBindTexture( GL_TEXTURE_2D, renderState->mario_texture );
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, SM64_TEXTURE_WIDTH, SM64_TEXTURE_HEIGHT, 0, GL_RGBA, GL_UNSIGNED_BYTE, marioTexture);
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}
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static void gl20_draw(RenderState *renderState, const vec3 camPos, const struct SM64MarioState *marioState, struct SM64MarioGeometryBuffers *marioGeo)
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{
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mat4 model, view, projection;
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glm_perspective( 45.0f, (float)WINDOW_WIDTH / (float)WINDOW_HEIGHT, 100.0f, 20000.0f, projection );
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glm_translate( view, (float*)camPos );
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glm_lookat( (float*)camPos, (float*)marioState->position, (vec3){0,1,0}, view );
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glm_mat4_identity( model );
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glMatrixMode(GL_PROJECTION);
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glLoadMatrixf((GLfloat*)projection);
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glMatrixMode(GL_MODELVIEW);
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glLoadMatrixf((GLfloat*)view);
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glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
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// draw world
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glEnableClientState(GL_VERTEX_ARRAY);
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glEnableClientState(GL_NORMAL_ARRAY);
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glEnableClientState(GL_COLOR_ARRAY);
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glDisableClientState(GL_TEXTURE_COORD_ARRAY);
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glVertexPointer(3, GL_FLOAT, 0, renderState->collision.position);
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glNormalPointer(GL_FLOAT, 0, renderState->collision.normal);
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glColorPointer(3, GL_FLOAT, 0, renderState->collision.color);
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glDrawElements(GL_TRIANGLES, renderState->collision.num_vertices, GL_UNSIGNED_SHORT, renderState->collision.index);
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// create lighting on the scene
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GLfloat light_position[] = { camPos[0], camPos[1], camPos[2], 1 };
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GLfloat light_diffuse[] = { 0.6f, 0.6f, 0.6f, 1 };
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GLfloat light_model[] = { 0.5f, 0.5f, 0.5f, 1 };
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glLightfv(GL_LIGHT0, GL_POSITION, light_position);
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glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
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glLightModelfv(GL_LIGHT_MODEL_AMBIENT, light_model);
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glShadeModel(GL_SMOOTH);
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glEnable(GL_COLOR_MATERIAL);
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glEnable(GL_LIGHTING);
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glEnable(GL_LIGHT0);
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// first, draw geometry without Mario's texture.
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update_mario_mesh( &renderState->mario, marioGeo );
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uint32_t triangleSize = renderState->mario.num_vertices;
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glDrawElements(GL_TRIANGLES, triangleSize, GL_UNSIGNED_SHORT, renderState->mario.index);
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// now disable the color array and enable the texture.
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glDisableClientState(GL_COLOR_ARRAY);
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glEnableClientState(GL_TEXTURE_COORD_ARRAY);
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glEnable(GL_TEXTURE_2D);
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glBindTexture(GL_TEXTURE_2D, renderState->mario_texture);
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glMatrixMode(GL_TEXTURE);
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glLoadIdentity();
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glDrawElements(GL_TRIANGLES, triangleSize, GL_UNSIGNED_SHORT, renderState->mario.index);
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glDisable(GL_TEXTURE_2D);
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glDisable(GL_LIGHTING);
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}
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struct Renderer gl20_renderer = {
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gl20_init,
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gl20_draw
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};
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@@ -0,0 +1,6 @@
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#ifndef GL20_RENDERER_H
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#define GL20_RENDERER_H
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extern struct Renderer gl20_renderer;
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#endif
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