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https://github.com/gnif/LookingGlass.git
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[egl] initial commit of new modern OpenGL ES renderer
This commit is contained in:
Geoffrey McRae
237
client/renderers/egl_model.c
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237
client/renderers/egl_model.c
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/*
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Looking Glass - KVM FrameRelay (KVMFR) Client
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Copyright (C) 2017 Geoffrey McRae <geoff@hostfission.com>
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https://looking-glass.hostfission.com
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "egl_model.h"
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#include "egl_shader.h"
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#include "debug.h"
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#include "utils.h"
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <SDL2/SDL_egl.h>
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struct EGL_Model
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{
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bool hasVertexBuffer;
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GLuint vertexBuffer;
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GLsizei vertexCount;
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bool hasUVBuffer;
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GLuint uvBuffer;
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EGL_Shader * shader;
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bool hasTexture;
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GLuint texture;
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bool hasPBO, pboUpdate;
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GLuint pbo[2];
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int pboIndex;
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size_t pboWidth, pboHeight;
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};
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bool egl_model_init(EGL_Model ** model)
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{
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*model = (EGL_Model *)malloc(sizeof(EGL_Model));
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if (!*model)
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{
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DEBUG_ERROR("Failed to malloc EGL_Model");
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return false;
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}
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memset(*model, 0, sizeof(EGL_Model));
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return true;
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}
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void egl_model_free(EGL_Model ** model)
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{
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if (!*model)
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return;
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if ((*model)->hasVertexBuffer)
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glDeleteBuffers(1, &(*model)->vertexBuffer);
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if ((*model)->hasUVBuffer)
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glDeleteBuffers(1, &(*model)->uvBuffer);
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if ((*model)->hasTexture)
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glDeleteTextures(1, &(*model)->texture);
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if ((*model)->hasPBO)
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glDeleteBuffers(2, (*model)->pbo);
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free(*model);
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*model = NULL;
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}
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bool egl_model_init_streaming(EGL_Model * model, size_t width, size_t height, size_t bufferSize)
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{
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model->pboWidth = width;
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model->pboHeight = height;
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glBindTexture(GL_TEXTURE_2D, egl_model_get_texture_id(model));
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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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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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glTexImage2D(GL_TEXTURE_2D, 0, GL_BGRA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
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glBindTexture(GL_TEXTURE_2D, 0);
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if (!model->hasPBO)
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glGenBuffers(2, model->pbo);
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for(int i = 0; i < 2; ++i)
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{
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glBindBuffer(GL_PIXEL_UNPACK_BUFFER, model->pbo[i]);
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glBufferData(
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GL_PIXEL_UNPACK_BUFFER,
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bufferSize,
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NULL,
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GL_STREAM_DRAW
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);
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glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
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}
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model->hasPBO = true;
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return true;
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}
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bool egl_model_is_streaming(EGL_Model * model)
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{
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return model->hasPBO;
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}
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bool egl_model_stream_buffer(EGL_Model * model, const uint8_t * buffer, size_t bufferSize)
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{
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if (++model->pboIndex == 2)
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model->pboIndex = 0;
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glBindBuffer(GL_PIXEL_UNPACK_BUFFER, model->pbo[model->pboIndex]);
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glBufferData(GL_PIXEL_UNPACK_BUFFER, bufferSize, 0, GL_STREAM_DRAW);
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GLubyte * ptr = glMapBuffer(GL_PIXEL_UNPACK_BUFFER, GL_WRITE_ONLY);
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if (!ptr)
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{
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DEBUG_ERROR("Failed to map the buffer");
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glBindTexture(GL_TEXTURE_2D, 0);
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glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
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return false;
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}
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memcpy(ptr, buffer, bufferSize);
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glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
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glBindTexture(GL_TEXTURE_2D, 0);
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glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
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model->pboUpdate = true;
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return true;
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}
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void egl_model_set_verticies(EGL_Model * model, const GLfloat * verticies, const size_t count)
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{
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if (model->hasVertexBuffer)
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glDeleteBuffers(1, &model->vertexBuffer);
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glGenBuffers(1, &model->vertexBuffer);
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glBindBuffer(GL_ARRAY_BUFFER, model->vertexBuffer);
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glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * count, verticies, GL_STATIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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model->hasVertexBuffer = true;
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model->vertexCount = count / 3;
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}
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void egl_model_set_uvs(EGL_Model * model, const GLfloat * uvs, const size_t count)
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{
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if (model->hasUVBuffer)
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glDeleteBuffers(1, &model->uvBuffer);
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glGenBuffers(1, &model->uvBuffer);
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glBindBuffer(GL_ARRAY_BUFFER, model->uvBuffer);
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glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * count, uvs, GL_STATIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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model->hasUVBuffer = true;
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}
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void egl_model_render(EGL_Model * model)
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{
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if (!model->hasVertexBuffer)
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{
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DEBUG_ERROR("Model has no verticies");
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return;
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}
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if (model->shader)
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egl_shader_use(model->shader);
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GLuint location = 0;
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glEnableVertexAttribArray(location);
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glBindBuffer(GL_ARRAY_BUFFER, model->vertexBuffer);
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glVertexAttribPointer(location, 3, GL_FLOAT, GL_FALSE, 0, (void*)0);
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if (model->hasUVBuffer)
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{
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++location;
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glEnableVertexAttribArray(location);
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glBindBuffer(GL_ARRAY_BUFFER, model->uvBuffer);
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glVertexAttribPointer(location, 2, GL_FLOAT, GL_FALSE, 0, (void*)0);
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}
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if (model->hasTexture)
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glBindTexture(GL_TEXTURE_2D, model->texture);
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glDrawArrays(GL_TRIANGLE_STRIP, 0, model->vertexCount);
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if (model->hasTexture)
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glBindTexture(GL_TEXTURE_2D, 0);
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while(location > 0)
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glDisableVertexAttribArray(location--);
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glDisableVertexAttribArray(0);
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if (model->shader)
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glUseProgram(0);
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if (model->pboUpdate)
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{
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glBindTexture(GL_TEXTURE_2D, egl_model_get_texture_id(model));
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glBindBuffer(GL_PIXEL_UNPACK_BUFFER, model->pbo[model->pboIndex]);
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glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, model->pboWidth, model->pboHeight, GL_RGBA, GL_UNSIGNED_BYTE, 0);
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model->pboUpdate = false;
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}
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}
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void egl_model_set_shader(EGL_Model * model, EGL_Shader * shader)
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{
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model->shader = shader;
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}
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GLuint egl_model_get_texture_id(EGL_Model * model)
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{
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if (model->hasTexture)
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return model->texture;
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glGenTextures(1, &model->texture);
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model->hasTexture = true;
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return model->texture;
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}
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