mirror of
https://github.com/n64dev/cen64.git
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c4afd44ed7
Replaced all references to simulation with emulation Updated copyright year Updated .gitignore to reduce chances of random files being uploaded to the repo Added .gitattributes to normalize all text files, and to ignore binary files (which includes the logo and the NEC PDF)
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
//
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// vi/render.c: Rendering functions.
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//
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// CEN64: Cycle-Accurate Nintendo 64 Emulator.
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// Copyright (C) 2015, Tyler J. Stachecki.
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//
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// This file is subject to the terms and conditions defined in
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// 'LICENSE', which is part of this source code package.
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//
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#include "common.h"
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#include "os/gl_window.h"
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#include "os/main.h"
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// Initializes OpenGL to an default state.
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void gl_window_init(struct vi_controller *vi) {
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glDisable(GL_DEPTH_TEST);
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glDisable(GL_LIGHTING);
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glDisable(GL_BLEND);
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glDisable(GL_DITHER);
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glEnable(GL_TEXTURE_2D);
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// Initialize the texture that we'll use for drawing the screen.
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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// Initialize vertex arrays for drawing.
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glEnableClientState(GL_VERTEX_ARRAY);
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glEnableClientState(GL_TEXTURE_COORD_ARRAY);
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glTexCoordPointer(2, GL_FLOAT, 0, vi->viuv);
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glVertexPointer(2, GL_FLOAT, 0, vi->quad);
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vi->quad[0] = vi->quad[5] =
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vi->quad[6] = vi->quad[7] = -1;
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vi->quad[1] = vi->quad[2] =
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vi->quad[3] = vi->quad[4] = 1;
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vi->viuv[2] = vi->viuv[4] =
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vi->viuv[5] = vi->viuv[7] = 1;
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// Tell OpenGL that the byte order is swapped.
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glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_TRUE);
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}
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// Renders a frame.
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void gl_window_render_frame(struct vi_controller *vi, const uint8_t *buffer,
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unsigned hres, unsigned vres, unsigned hskip, unsigned type) {
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float aspect;
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switch(type) {
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case 0:
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return;
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case 1:
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assert(0 && "Attempted to use reserved frame type.");
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return;
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case 2:
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, hres + hskip, vres,
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0, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, buffer);
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break;
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case 3:
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, hres + hskip, vres,
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0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
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break;
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}
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aspect = (float) hres / (hres + hskip);
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vi->viuv[2] = vi->viuv[4] = aspect;
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glDrawArrays(GL_QUADS, 0, 4);
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cen64_gl_window_swap_buffers(vi->window);
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}
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// Called when the window was resized.
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void gl_window_resize_cb(int width, int height) {
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float aspect = 4.0 / 3.0;
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if (height <= 0)
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height = 1;
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glViewport(0, 0, width, height);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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if((float) width / (float) height > aspect) {
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aspect = 3.0 / 4.0;
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aspect *= (float)width / (float)height;
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glOrtho(-aspect, aspect, -1, 1, -1, 1);
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}
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else {
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aspect *= (float)height / (float)width;
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glOrtho(-1, 1, -aspect, aspect, -1, 1);
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}
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glClear(GL_COLOR_BUFFER_BIT);
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}
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