123 lines
3.1 KiB
C
Executable file
123 lines
3.1 KiB
C
Executable file
#include "skybox.h"
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#include "shader.h"
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#include "camera.h"
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#include <string.h>
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#include "openglrender.h"
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static const float skyboxVertices[216] = {
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-1.0f, 1.0f, -1.0f,
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-1.0f, -1.0f, -1.0f,
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1.0f, -1.0f, -1.0f,
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1.0f, -1.0f, -1.0f,
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1.0f, 1.0f, -1.0f,
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-1.0f, 1.0f, -1.0f,
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-1.0f, -1.0f, 1.0f,
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-1.0f, -1.0f, -1.0f,
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-1.0f, 1.0f, -1.0f,
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-1.0f, 1.0f, -1.0f,
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-1.0f, 1.0f, 1.0f,
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-1.0f, -1.0f, 1.0f,
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1.0f, -1.0f, -1.0f,
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1.0f, -1.0f, 1.0f,
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1.0f, 1.0f, 1.0f,
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1.0f, 1.0f, 1.0f,
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1.0f, 1.0f, -1.0f,
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1.0f, -1.0f, -1.0f,
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-1.0f, -1.0f, 1.0f,
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-1.0f, 1.0f, 1.0f,
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1.0f, 1.0f, 1.0f,
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1.0f, 1.0f, 1.0f,
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1.0f, -1.0f, 1.0f,
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-1.0f, -1.0f, 1.0f,
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-1.0f, 1.0f, -1.0f,
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1.0f, 1.0f, -1.0f,
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1.0f, 1.0f, 1.0f,
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1.0f, 1.0f, 1.0f,
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-1.0f, 1.0f, 1.0f,
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-1.0f, 1.0f, -1.0f,
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-1.0f, -1.0f, -1.0f,
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-1.0f, -1.0f, 1.0f,
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1.0f, -1.0f, -1.0f,
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1.0f, -1.0f, -1.0f,
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-1.0f, -1.0f, 1.0f,
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1.0f, -1.0f, 1.0f
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};
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struct mSkybox *MakeSkybox(const char *cubemap)
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{
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struct mSkybox *newskybox =
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(struct mSkybox *) malloc(sizeof(struct mSkybox));
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newskybox->shader = MakeShader("skyvert.glsl", "skyfrag.glsl");
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shader_compile(newskybox->shader);
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glGenVertexArrays(1, &newskybox->VAO);
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glGenBuffers(1, &newskybox->VBO);
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glBindVertexArray(newskybox->VAO);
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glBindBuffer(GL_ARRAY_BUFFER, newskybox->VBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(skyboxVertices), &skyboxVertices,
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GL_STATIC_DRAW);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float),
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(void *) 0);
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shader_use(newskybox->shader);
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shader_setint(newskybox->shader, "skybox", 0);
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const char *faces[6] =
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{ "right.jpg", "left.jpg", "top.jpg", "bottom.jpg", "front.jpg",
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"back.jpg"
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};
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glGenTextures(1, &newskybox->id);
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glBindTexture(GL_TEXTURE_CUBE_MAP, newskybox->id);
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char buf[100] = { '\0' };
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for (unsigned int i = 0; i < 6; i++) {
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buf[0] = '\0';
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strcat(buf, cubemap);
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strcat(buf, "/");
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strcat(buf, faces[i]);
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SDL_Surface *data = NULL; //IMG_Load(buf);
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glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB, 2048,
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2048, 0, GL_RGB, GL_UNSIGNED_BYTE, data->pixels);
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SDL_FreeSurface(data);
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}
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S,
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GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T,
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GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R,
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GL_CLAMP_TO_EDGE);
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return newskybox;
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}
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void skybox_draw(const struct mSkybox *skybox,
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const struct mCamera *camera)
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{
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shader_use(skybox->shader);
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mfloat_t view[16] = { 0.f };
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getviewmatrix(view, camera);
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shader_setmat4(skybox->shader, "skyview", view);
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// skybox cube
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glBindVertexArray(skybox->VAO);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_CUBE_MAP, skybox->id);
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glDrawArrays(GL_TRIANGLES, 0, 36);
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glBindVertexArray(0);
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}
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