318 lines
12 KiB
C
318 lines
12 KiB
C
#include "gl33core_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 "../cglm.h"
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#include "../level.h"
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static const char *MARIO_SHADER =
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"\n uniform mat4 view;"
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"\n uniform mat4 projection;"
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"\n uniform sampler2D marioTex;"
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"\n "
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"\n v2f vec3 v_color;"
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"\n v2f vec3 v_normal;"
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"\n v2f vec3 v_light;"
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"\n v2f vec2 v_uv;"
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"\n "
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"\n #ifdef VERTEX"
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"\n "
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"\n layout(location = 0) in vec3 position;"
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"\n layout(location = 1) in vec3 normal;"
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"\n layout(location = 2) in vec3 color;"
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"\n layout(location = 3) in vec2 uv;"
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"\n "
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"\n void main()"
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"\n {"
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"\n v_color = color;"
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"\n v_normal = normal;"
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"\n v_light = transpose( mat3( view )) * normalize( vec3( 1 ));"
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"\n v_uv = uv;"
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"\n "
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"\n gl_Position = projection * view * vec4( position, 1. );"
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"\n }"
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"\n "
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"\n #endif"
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"\n #ifdef FRAGMENT"
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"\n "
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"\n out vec4 color;"
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"\n "
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"\n void main() "
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"\n {"
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"\n float light = .5 + .5 * clamp( dot( v_normal, v_light ), 0., 1. );"
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"\n vec4 texColor = texture2D( marioTex, v_uv );"
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"\n vec3 mainColor = mix( v_color, texColor.rgb, texColor.a ); // v_uv.x >= 0. ? texColor.a : 0. );"
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"\n color = vec4( mainColor * light, 1 );"
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"\n }"
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"\n "
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"\n #endif";
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static const char *WORLD_SHADER =
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"\n uniform mat4 model;"
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"\n uniform mat4 view;"
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"\n uniform mat4 projection;"
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"\n uniform sampler2D tex;"
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"\n "
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"\n v2f vec3 v_normal;"
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"\n v2f vec3 v_worldPos;"
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"\n "
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"\n #ifdef VERTEX"
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"\n "
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"\n layout(location = 0) in vec3 position;"
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"\n layout(location = 1) in vec3 normal;"
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"\n "
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"\n void main()"
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"\n {"
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"\n v_normal = inverse(mat3(model)) * normal;"
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"\n vec4 worldPos4 = model * vec4(position, 1.);"
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"\n v_worldPos = worldPos4.xyz;"
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"\n gl_Position = projection * view * worldPos4;"
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"\n }"
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"\n "
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"\n #endif"
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"\n #ifdef FRAGMENT"
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"\n "
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"\n vec3 tri( vec3 x )"
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"\n {"
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"\n return abs(x-floor(x)-.5);"
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"\n } "
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"\n float surfFunc( vec3 p )"
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"\n {"
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"\n float n = dot(tri(p*.15 + tri(p.yzx*.075)), vec3(.444));"
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"\n p = p*1.5773 - n;"
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"\n p.yz = vec2(p.y + p.z, p.z - p.y) * .866;"
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"\n p.xz = vec2(p.x + p.z, p.z - p.x) * .866;"
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"\n n += dot(tri(p*.225 + tri(p.yzx*.1125)), vec3(.222)); "
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"\n return abs(n-.5)*1.9 + (1.-abs(sin(n*9.)))*.05;"
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"\n }"
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"\n "
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"\n const vec3 light_x = vec3(-1.0, 0.4, 0.9);"
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"\n "
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"\n out vec4 color;"
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"\n "
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"\n void main() "
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"\n {"
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"\n float surfy = surfFunc( v_worldPos / 50. );"
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"\n float brightness = smoothstep( .2, .3, surfy );"
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"\n "
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"\n color = vec4( (0.5 + 0.25 * brightness) * (.5+.5*v_normal), 1 );"
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"\n }"
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"\n "
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"\n #endif";
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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->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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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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glGenVertexArrays(1, &mesh->vao);
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glBindVertexArray(mesh->vao);
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#define X( loc, buff, arr, type ) do { \
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glGenBuffers( 1, &buff ); \
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glBindBuffer( GL_ARRAY_BUFFER, buff ); \
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glBufferData( GL_ARRAY_BUFFER, mesh->num_vertices*sizeof( type ), arr, GL_STATIC_DRAW ); \
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glEnableVertexAttribArray( loc ); \
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glVertexAttribPointer( loc, sizeof( type ) / sizeof( float ), GL_FLOAT, GL_FALSE, sizeof( type ), NULL ); \
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} while( 0 )
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X(0, mesh->position_buffer, mesh->position, vec3);
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X(1, mesh->normal_buffer, mesh->normal, vec3);
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#undef X
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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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glGenVertexArrays(1, &mesh->vao);
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glBindVertexArray(mesh->vao);
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#define X( loc, buff, arr, type ) do { \
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glGenBuffers( 1, &buff ); \
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glBindBuffer( GL_ARRAY_BUFFER, buff ); \
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glBufferData( GL_ARRAY_BUFFER, sizeof( type ) * 3 * SM64_GEO_MAX_TRIANGLES, arr, GL_DYNAMIC_DRAW ); \
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glEnableVertexAttribArray( loc ); \
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glVertexAttribPointer( loc, sizeof( type ) / sizeof( float ), GL_FLOAT, GL_FALSE, sizeof( type ), NULL ); \
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} while( 0 )
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X(0, mesh->position_buffer, marioGeo->position, vec3);
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X(1, mesh->normal_buffer, marioGeo->normal, vec3);
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X(2, mesh->color_buffer, marioGeo->color, vec3);
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X(3, mesh->uv_buffer, marioGeo->uv, vec2);
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#undef X
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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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glBindBuffer(GL_ARRAY_BUFFER, mesh->position_buffer);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vec3) * 3 * SM64_GEO_MAX_TRIANGLES, marioGeo->position, GL_DYNAMIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, mesh->normal_buffer);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vec3) * 3 * SM64_GEO_MAX_TRIANGLES, marioGeo->normal, GL_DYNAMIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, mesh->color_buffer);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vec3) * 3 * SM64_GEO_MAX_TRIANGLES, marioGeo->color, GL_DYNAMIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, mesh->uv_buffer);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vec2) * 3 * SM64_GEO_MAX_TRIANGLES, marioGeo->uv, GL_DYNAMIC_DRAW);
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}
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static GLuint shader_compile(const char *shaderContents, size_t shaderContentsLength, GLenum shaderType)
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{
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const GLchar *shaderDefine = shaderType == GL_VERTEX_SHADER
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? "\n#version 330\n#define VERTEX \n#define v2f out\n"
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: "\n#version 330\n#define FRAGMENT\n#define v2f in \n";
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const GLchar *shaderStrings[2] = {shaderDefine, shaderContents};
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GLint shaderStringLengths[2] = {strlen(shaderDefine), (GLint)shaderContentsLength};
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GLuint shader = glCreateShader(shaderType);
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glShaderSource(shader, 2, shaderStrings, shaderStringLengths);
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glCompileShader(shader);
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GLint isCompiled;
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glGetShaderiv(shader, GL_COMPILE_STATUS, &isCompiled);
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if (isCompiled == GL_FALSE)
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{
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GLint maxLength;
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glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &maxLength);
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char *log = malloc(maxLength);
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glGetShaderInfoLog(shader, maxLength, &maxLength, log);
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printf("Error in shader: %s\n%s\n%s\n", log, shaderStrings[0], shaderStrings[1]);
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exit(1);
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}
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return shader;
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}
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static GLuint shader_load(const char *shaderContents)
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{
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GLuint vert = shader_compile(shaderContents, strlen(shaderContents), GL_VERTEX_SHADER);
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GLuint frag = shader_compile(shaderContents, strlen(shaderContents), GL_FRAGMENT_SHADER);
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GLuint ref = glCreateProgram();
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glAttachShader(ref, vert);
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glAttachShader(ref, frag);
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glLinkProgram(ref);
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glDetachShader(ref, vert);
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glDetachShader(ref, frag);
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GLuint result = ref;
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return result;
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}
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static void gl33core_init(RenderState *renderState, uint8_t *marioTexture)
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{
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load_collision_mesh(&renderState->collision);
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renderState->world_shader = shader_load(WORLD_SHADER);
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renderState->mario_shader = shader_load(MARIO_SHADER);
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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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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 gl33core_draw(RenderState *renderState, const vec3 camPos, const struct SM64MarioState *marioState, struct SM64MarioGeometryBuffers *marioGeo)
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{
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update_mario_mesh(&renderState->mario, marioGeo);
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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)
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{
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0, 1, 0
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}
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,
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view
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)
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;
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glm_mat4_identity(model);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glUseProgram(renderState->world_shader);
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glBindVertexArray(renderState->collision.vao);
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glUniformMatrix4fv(glGetUniformLocation(renderState->world_shader, "model"), 1, GL_FALSE, (GLfloat *)model);
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glUniformMatrix4fv(glGetUniformLocation(renderState->world_shader, "view"), 1, GL_FALSE, (GLfloat *)view);
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glUniformMatrix4fv(glGetUniformLocation(renderState->world_shader, "projection"), 1, GL_FALSE, (GLfloat *)projection);
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glDrawElements(GL_TRIANGLES, renderState->collision.num_vertices, GL_UNSIGNED_SHORT, renderState->collision.index);
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glUseProgram(renderState->mario_shader);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, renderState->mario_texture);
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glBindVertexArray(renderState->mario.vao);
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glUniformMatrix4fv(glGetUniformLocation(renderState->mario_shader, "view"), 1, GL_FALSE, (GLfloat *)view);
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glUniformMatrix4fv(glGetUniformLocation(renderState->mario_shader, "projection"), 1, GL_FALSE, (GLfloat *)projection);
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glUniform1i(glGetUniformLocation(renderState->mario_shader, "marioTex"), 0);
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glDrawElements(GL_TRIANGLES, renderState->mario.num_vertices, GL_UNSIGNED_SHORT, renderState->mario.index);
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}
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struct Renderer gl33core_renderer = {
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gl33core_init,
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gl33core_draw
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};
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