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//
// Copyright 2015 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
// names, trademarks, service marks, or product names of the Licensor
// and its affiliates, except as required to comply with Section 4(c) of
// the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#include "glLoader.h"
#include "glControlMeshDisplay.h"
#include "glUtils.h"
#include <vector>
GLControlMeshDisplay::GLControlMeshDisplay() :
_displayEdges(true), _displayVertices(false),
_program(0), _vao(0),
_vertSharpness(0), _edgeSharpnessTexture(0), _edgeIndices(0),
_numEdges(0), _numPoints(0) {
}
GLControlMeshDisplay::~GLControlMeshDisplay() {
if (_program) glDeleteProgram(_program);
if (_vertSharpness) glDeleteBuffers(1, &_vertSharpness);
if (_edgeSharpnessTexture) glDeleteTextures(1, &_edgeSharpnessTexture);
if (_edgeIndices) glDeleteBuffers(1, &_edgeIndices);
if (_vao) glDeleteVertexArrays(1, &_vao);
}
bool
GLControlMeshDisplay::createProgram() {
if (_program != 0) glDeleteProgram(_program);
const std::string glsl_version = GLUtils::GetShaderVersionInclude();
static const std::string vsSrc =
glsl_version +
"in vec3 position; \n"
"in float vertSharpness; \n"
"out float sharpness; \n"
"uniform mat4 mvpMatrix; \n"
"void main() { \n"
" sharpness = vertSharpness; \n"
" gl_Position = mvpMatrix * vec4(position, 1); \n"
"} \n";
static const std::string fsSrc =
glsl_version +
"in float sharpness; \n"
"out vec4 color; \n"
"uniform int drawMode = 0; \n"
"uniform samplerBuffer edgeSharpness; \n"
"vec4 sharpnessToColor(float s) { \n"
" // 0.0 2.0 4.0 \n"
" // green --- yellow --- red \n"
" return vec4(min(1, s * 0.5), \n"
" min(1, 2 - s * 0.5), \n"
" 0, 1); \n"
"} \n"
"void main() { \n"
" float sharp = sharpness; \n"
" if (drawMode == 1) { \n"
" sharp = texelFetch(edgeSharpness, gl_PrimitiveID).x; \n"
" } \n"
" color = sharpnessToColor(sharp); \n"
"} \n";
GLuint vertexShader =
GLUtils::CompileShader(GL_VERTEX_SHADER, vsSrc.c_str());
GLuint fragmentShader =
GLUtils::CompileShader(GL_FRAGMENT_SHADER, fsSrc.c_str());
_program = glCreateProgram();
glAttachShader(_program, vertexShader);
glAttachShader(_program, fragmentShader);
glLinkProgram(_program);
GLint status;
glGetProgramiv(_program, GL_LINK_STATUS, &status);
if (status == GL_FALSE) {
GLint infoLogLength;
glGetProgramiv(_program, GL_INFO_LOG_LENGTH, &infoLogLength);
char *infoLog = new char[infoLogLength];
glGetProgramInfoLog(_program, infoLogLength, NULL, infoLog);
printf("%s\n", infoLog);
delete[] infoLog;
exit(1);
return false;
}
_uniformMvpMatrix =
glGetUniformLocation(_program, "mvpMatrix");
_uniformDrawMode =
glGetUniformLocation(_program, "drawMode");
_uniformEdgeSharpness =
glGetUniformLocation(_program, "edgeSharpness");
_attrPosition = glGetAttribLocation(_program, "position");
_attrVertSharpness = glGetAttribLocation(_program, "vertSharpness");
return true;
}
void
GLControlMeshDisplay::Draw(GLuint vbo, GLint stride,
const float *modelViewProjectionMatrix) {
if (_program == 0) {
createProgram();
if (_program == 0) return;
}
if (_vao == 0) {
glGenVertexArrays(1, &_vao);
}
glBindVertexArray(_vao);
glUseProgram(_program);
glUniformMatrix4fv(_uniformMvpMatrix,
1, GL_FALSE, modelViewProjectionMatrix);
glUniform1i(_uniformEdgeSharpness, 0);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_BUFFER, _edgeSharpnessTexture);
// bind vbo to points
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glVertexAttribPointer(_attrPosition, 3, GL_FLOAT, GL_FALSE, stride, 0);
glBindBuffer(GL_ARRAY_BUFFER, _vertSharpness);
glVertexAttribPointer(_attrVertSharpness, 1, GL_FLOAT, GL_FALSE, 0, 0);
glPointSize(10.0);
// draw edges
if (_displayEdges) {
glUniform1i(_uniformDrawMode, 1);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _edgeIndices);
glDrawElements(GL_LINES, _numEdges*2, GL_UNSIGNED_INT, 0);
}
// draw vertices
if (_displayVertices) {
glUniform1i(_uniformDrawMode, 0);
glDrawArrays(GL_POINTS, 0, _numPoints);
}
glPointSize(1.0f);
glDisableVertexAttribArray(0);
glDisableVertexAttribArray(1);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
glUseProgram(0);
}
void
GLControlMeshDisplay::SetTopology(OpenSubdiv::Far::TopologyLevel const &level) {
int nEdges = level.GetNumEdges();
int nVerts = level.GetNumVertices();
std::vector<int> edgeIndices;
std::vector<float> edgeSharpnesses;
std::vector<float> vertSharpnesses;
edgeIndices.reserve(nEdges * 2);
edgeSharpnesses.reserve(nEdges);
vertSharpnesses.reserve(nVerts);
for (int i = 0; i < nEdges; ++i) {
OpenSubdiv::Far::ConstIndexArray verts = level.GetEdgeVertices(i);
edgeIndices.push_back(verts[0]);
edgeIndices.push_back(verts[1]);
edgeSharpnesses.push_back(level.GetEdgeSharpness(i));
}
for (int i = 0; i < nVerts; ++i) {
vertSharpnesses.push_back(level.GetVertexSharpness(i));
}
if (_vertSharpness == 0) glGenBuffers(1, &_vertSharpness);
if (_edgeIndices == 0) glGenBuffers(1, &_edgeIndices);
if (_edgeSharpnessTexture == 0) glGenTextures(1, &_edgeSharpnessTexture);
GLuint buffer = 0;
glGenBuffers(1, &buffer);
glBindBuffer(GL_ARRAY_BUFFER, _vertSharpness);
glBufferData(GL_ARRAY_BUFFER, sizeof(float)*nVerts,
&vertSharpnesses[0], GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, _edgeIndices);
glBufferData(GL_ARRAY_BUFFER, sizeof(int)*nEdges*2,
&edgeIndices[0], GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, buffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(float)*nEdges,
&edgeSharpnesses[0], GL_STATIC_DRAW);
glBindTexture(GL_TEXTURE_BUFFER, _edgeSharpnessTexture);
glTexBuffer(GL_TEXTURE_BUFFER, GL_R32F, buffer);
glBindTexture(GL_TEXTURE_BUFFER, 0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glDeleteBuffers(1, &buffer);
_numEdges = nEdges;
_numPoints = nVerts;
}
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