mirror of https://github.com/bsnes-emu/bsnes.git
115 lines
3.8 KiB
C++
Executable File
115 lines
3.8 KiB
C++
Executable File
auto OpenGLSurface::allocate() -> void {
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glGenVertexArrays(1, &vao);
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glBindVertexArray(vao);
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glGenBuffers(3, &vbo[0]);
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}
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auto OpenGLSurface::size(uint w, uint h) -> void {
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if(width == w && height == h) return;
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width = w, height = h;
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w = glrSize(w), h = glrSize(h);
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if(texture) { glDeleteTextures(1, &texture); texture = 0; }
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if(buffer) { delete[] buffer; buffer = nullptr; }
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buffer = new uint32_t[w * h]();
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glGenTextures(1, &texture);
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glBindTexture(GL_TEXTURE_2D, texture);
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glTexImage2D(GL_TEXTURE_2D, 0, format, w, h, 0, getFormat(), getType(), buffer);
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if(framebuffer) {
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, framebuffer);
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
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delete[] buffer;
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buffer = nullptr;
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}
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}
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auto OpenGLSurface::release() -> void {
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if(vbo[0]) { glDeleteBuffers(3, &vbo[0]); for(auto &o : vbo) o = 0; }
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if(vao) { glDeleteVertexArrays(1, &vao); vao = 0; }
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if(vertex) { glDetachShader(program, vertex); glDeleteShader(vertex); vertex = 0; }
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if(geometry) { glDetachShader(program, geometry); glDeleteShader(geometry); geometry = 0; }
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if(fragment) { glDetachShader(program, fragment); glDeleteShader(fragment); fragment = 0; }
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if(texture) { glDeleteTextures(1, &texture); texture = 0; }
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if(framebuffer) { glDeleteFramebuffers(1, &framebuffer); framebuffer = 0; }
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if(program) { glDeleteProgram(program); program = 0; }
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width = 0, height = 0;
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}
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auto OpenGLSurface::render(uint sourceWidth, uint sourceHeight, uint targetWidth, uint targetHeight) -> void {
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glViewport(0, 0, targetWidth, targetHeight);
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float w = (float)sourceWidth / (float)glrSize(sourceWidth);
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float h = (float)sourceHeight / (float)glrSize(sourceHeight);
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float u = (float)targetWidth, v = (float)targetHeight;
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GLint location;
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GLfloat modelView[] = {
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1, 0, 0, 0,
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0, 1, 0, 0,
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0, 0, 1, 0,
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0, 0, 0, 1,
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};
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GLfloat projection[] = {
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2.0f/u, 0.0f, 0.0f, 0.0f,
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0.0f, 2.0f/v, 0.0f, 0.0f,
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0.0f, 0.0f, -1.0f, 0.0f,
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-1.0f, -1.0f, 0.0f, 1.0f,
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};
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GLfloat modelViewProjection[4 * 4];
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MatrixMultiply(modelViewProjection, modelView, 4, 4, projection, 4, 4);
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GLfloat vertices[] = {
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0, 0, 0, 1,
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u, 0, 0, 1,
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0, v, 0, 1,
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u, v, 0, 1,
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};
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GLfloat positions[4 * 4];
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for(uint n = 0; n < 16; n += 4) {
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MatrixMultiply(&positions[n], &vertices[n], 1, 4, modelViewProjection, 4, 4);
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}
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GLfloat texCoords[] = {
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0, 0,
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w, 0,
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0, h,
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w, h,
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};
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glrUniformMatrix4fv("modelView", modelView);
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glrUniformMatrix4fv("projection", projection);
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glrUniformMatrix4fv("modelViewProjection", modelViewProjection);
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glBindVertexArray(vao);
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glBindBuffer(GL_ARRAY_BUFFER, vbo[0]);
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glBufferData(GL_ARRAY_BUFFER, 16 * sizeof(GLfloat), vertices, GL_STATIC_DRAW);
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GLint locationVertex = glGetAttribLocation(program, "vertex");
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glEnableVertexAttribArray(locationVertex);
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glVertexAttribPointer(locationVertex, 4, GL_FLOAT, GL_FALSE, 0, 0);
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glBindBuffer(GL_ARRAY_BUFFER, vbo[1]);
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glBufferData(GL_ARRAY_BUFFER, 16 * sizeof(GLfloat), positions, GL_STATIC_DRAW);
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GLint locationPosition = glGetAttribLocation(program, "position");
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glEnableVertexAttribArray(locationPosition);
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glVertexAttribPointer(locationPosition, 4, GL_FLOAT, GL_FALSE, 0, 0);
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glBindBuffer(GL_ARRAY_BUFFER, vbo[2]);
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glBufferData(GL_ARRAY_BUFFER, 8 * sizeof(GLfloat), texCoords, GL_STATIC_DRAW);
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GLint locationTexCoord = glGetAttribLocation(program, "texCoord");
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glEnableVertexAttribArray(locationTexCoord);
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glVertexAttribPointer(locationTexCoord, 2, GL_FLOAT, GL_FALSE, 0, 0);
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glBindFragDataLocation(program, 0, "fragColor");
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
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glDisableVertexAttribArray(locationVertex);
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glDisableVertexAttribArray(locationPosition);
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glDisableVertexAttribArray(locationTexCoord);
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}
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