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Initial GL rendering support of curves primitive(render as GL_LINES).

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This commit is contained in:
Syoyo Fujita 2016-10-18 20:39:33 +09:00
parent 8038965d33
commit ebce2521b2
2 changed files with 54 additions and 100 deletions
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147
examples/glview/glview.cc
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@ -57,6 +57,7 @@ typedef struct {
typedef struct {
GLuint vb; // vertex buffer
size_t count; // byte count
} GLCurvesState;
std::map<std::string, GLBufferState> gBufferState;
@ -318,11 +319,13 @@ static void SetupGLState(tinygltf::Scene &scene, GLuint progId) {
GLint uvloc = glGetAttribLocation(progId, "in_texcoord");
GLint diffuseTexLoc = glGetUniformLocation(progId, "diffuseTex");
GLint isCurvesLoc = glGetUniformLocation(progId, "uIsCurves");
gGLProgramState.attribs["POSITION"] = vtloc;
gGLProgramState.attribs["NORMAL"] = nrmloc;
gGLProgramState.attribs["TEXCOORD_0"] = uvloc;
gGLProgramState.uniforms["diffuseTex"] = diffuseTexLoc;
gGLProgramState.uniforms["isCurvesLoc"] = isCurvesLoc;
};
// Setup curves geometry extension
@ -378,10 +381,10 @@ static void SetupCurvesState(tinygltf::Scene &scene, GLuint progId) {
const tinygltf::Buffer &vtx_buffer = scene.buffers[vtx_bufferView.buffer];
const tinygltf::Buffer &nverts_buffer = scene.buffers[nverts_bufferView.buffer];
std::cout << "vtx_bufferView = " << vtx_accessor.bufferView << std::endl;
std::cout << "nverts_bufferView = " << nverts_accessor.bufferView << std::endl;
std::cout << "vtx_buffer.size = " << vtx_buffer.data.size() << std::endl;
std::cout << "nverts_buffer.size = " << nverts_buffer.data.size() << std::endl;
//std::cout << "vtx_bufferView = " << vtx_accessor.bufferView << std::endl;
//std::cout << "nverts_bufferView = " << nverts_accessor.bufferView << std::endl;
//std::cout << "vtx_buffer.size = " << vtx_buffer.data.size() << std::endl;
//std::cout << "nverts_buffer.size = " << nverts_buffer.data.size() << std::endl;
const int *nverts = reinterpret_cast<const int*>(nverts_buffer.data.data());
const float *vtx = reinterpret_cast<const float*>(vtx_buffer.data.data());
@ -400,6 +403,7 @@ static void SetupCurvesState(tinygltf::Scene &scene, GLuint progId) {
line_pts.push_back(vtx[3 * (vtx_offset + n+1) + 0]);
line_pts.push_back(vtx[3 * (vtx_offset + n+1) + 1]);
line_pts.push_back(vtx[3 * (vtx_offset + n+1) + 2]);
}
vtx_offset += nverts[k];
@ -411,6 +415,9 @@ static void SetupCurvesState(tinygltf::Scene &scene, GLuint progId) {
glBufferData(GL_ARRAY_BUFFER, line_pts.size() * sizeof(float),
line_pts.data(), GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
state.count = line_pts.size() / 3 / 2; // 2 = GL_LINES
gCurvesMesh[mesh.name] = state;
// Material
tinygltf::Material &mat = scene.materials[primitive.material];
@ -455,24 +462,31 @@ static void SetupCurvesState(tinygltf::Scene &scene, GLuint progId) {
GLint uvloc = glGetAttribLocation(progId, "in_texcoord");
GLint diffuseTexLoc = glGetUniformLocation(progId, "diffuseTex");
GLint isCurvesLoc = glGetUniformLocation(progId, "uIsCurves");
gGLProgramState.attribs["POSITION"] = vtloc;
gGLProgramState.attribs["NORMAL"] = nrmloc;
gGLProgramState.attribs["TEXCOORD_0"] = uvloc;
gGLProgramState.uniforms["diffuseTex"] = diffuseTexLoc;
gGLProgramState.uniforms["uIsCurves"] = isCurvesLoc;
};
void DrawMesh(tinygltf::Scene &scene, const tinygltf::Mesh &mesh) {
if (gGLProgramState.uniforms["diffuseTex"] >= 0) {
glUniform1i(gGLProgramState.uniforms["diffuseTex"], 0); // TEXTURE0
}
// Skip curves primitive.
if (gCurvesMesh.find(mesh.name) != gCurvesMesh.end()) {
return;
}
if (gGLProgramState.uniforms["diffuseTex"] >= 0) {
glUniform1i(gGLProgramState.uniforms["diffuseTex"], 0); // TEXTURE0
}
if (gGLProgramState.uniforms["isCurvesLoc"] >= 0) {
glUniform1i(gGLProgramState.uniforms["isCurvesLoc"], 0);
}
for (size_t i = 0; i < mesh.primitives.size(); i++) {
const tinygltf::Primitive &primitive = mesh.primitives[i];
@ -509,14 +523,14 @@ void DrawMesh(tinygltf::Scene &scene, const tinygltf::Mesh &mesh) {
(it->first.compare("NORMAL") == 0) ||
(it->first.compare("TEXCOORD_0") == 0)) {
if (gGLProgramState.attribs[it->first] >= 0) {
glVertexAttribPointer(
gGLProgramState.attribs[it->first], count, accessor.componentType,
GL_FALSE, accessor.byteStride, BUFFER_OFFSET(accessor.byteOffset));
CheckErrors("vertex attrib pointer");
glEnableVertexAttribArray(gGLProgramState.attribs[it->first]);
CheckErrors("enable vertex attrib array");
}
if (gGLProgramState.attribs[it->first] >= 0) {
glVertexAttribPointer(
gGLProgramState.attribs[it->first], count, accessor.componentType,
GL_FALSE, accessor.byteStride, BUFFER_OFFSET(accessor.byteOffset));
CheckErrors("vertex attrib pointer");
glEnableVertexAttribArray(gGLProgramState.attribs[it->first]);
CheckErrors("enable vertex attrib array");
}
}
}
@ -565,98 +579,32 @@ void DrawMesh(tinygltf::Scene &scene, const tinygltf::Mesh &mesh) {
void DrawCurves(tinygltf::Scene &scene, const tinygltf::Mesh &mesh) {
if (gGLProgramState.uniforms["diffuseTex"] >= 0) {
glUniform1i(gGLProgramState.uniforms["diffuseTex"], 0); // TEXTURE0
}
(void)scene;
if (gCurvesMesh.find(mesh.name) == gCurvesMesh.end()) {
return;
}
for (size_t i = 0; i < mesh.primitives.size(); i++) {
const tinygltf::Primitive &primitive = mesh.primitives[i];
if (gGLProgramState.uniforms["isCurvesLoc"] >= 0) {
glUniform1i(gGLProgramState.uniforms["isCurvesLoc"], 1);
}
GLCurvesState &state = gCurvesMesh[mesh.name];
std::map<std::string, std::string>::const_iterator it(
primitive.attributes.begin());
std::map<std::string, std::string>::const_iterator itEnd(
primitive.attributes.end());
if (gGLProgramState.attribs["POSITION"] >= 0) {
glBindBuffer(GL_ARRAY_BUFFER, state.vb);
glVertexAttribPointer(
gGLProgramState.attribs["POSITION"], 3, GL_FLOAT,
GL_FALSE, /* stride */0, BUFFER_OFFSET(0));
CheckErrors("curve: vertex attrib pointer");
glEnableVertexAttribArray(gGLProgramState.attribs["POSITION"]);
CheckErrors("curve: enable vertex attrib array");
}
// Assume TEXTURE_2D target for the texture object.
glBindTexture(GL_TEXTURE_2D, gMeshState[mesh.name].diffuseTex[i]);
glDrawArrays(GL_LINES, 0, state.count);
for (; it != itEnd; it++) {
const tinygltf::Accessor &accessor = scene.accessors[it->second];
glBindBuffer(GL_ARRAY_BUFFER, gBufferState[accessor.bufferView].vb);
CheckErrors("bind buffer");
int count = 1;
if (accessor.type == TINYGLTF_TYPE_SCALAR) {
count = 1;
} else if (accessor.type == TINYGLTF_TYPE_VEC2) {
count = 2;
} else if (accessor.type == TINYGLTF_TYPE_VEC3) {
count = 3;
} else if (accessor.type == TINYGLTF_TYPE_VEC4) {
count = 4;
} else {
assert(0);
}
// it->first would be "POSITION", "NORMAL", "TEXCOORD_0", ...
if ((it->first.compare("POSITION") == 0) ||
(it->first.compare("NORMAL") == 0) ||
(it->first.compare("TEXCOORD_0") == 0)) {
if (gGLProgramState.attribs[it->first] >= 0) {
glVertexAttribPointer(
gGLProgramState.attribs[it->first], count, accessor.componentType,
GL_FALSE, accessor.byteStride, BUFFER_OFFSET(accessor.byteOffset));
CheckErrors("vertex attrib pointer");
glEnableVertexAttribArray(gGLProgramState.attribs[it->first]);
CheckErrors("enable vertex attrib array");
}
}
}
const tinygltf::Accessor &indexAccessor = scene.accessors[primitive.indices];
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,
gBufferState[indexAccessor.bufferView].vb);
CheckErrors("bind buffer");
int mode = -1;
if (primitive.mode == TINYGLTF_MODE_TRIANGLES) {
mode = GL_TRIANGLES;
} else if (primitive.mode == TINYGLTF_MODE_TRIANGLE_STRIP) {
mode = GL_TRIANGLE_STRIP;
} else if (primitive.mode == TINYGLTF_MODE_TRIANGLE_FAN) {
mode = GL_TRIANGLE_FAN;
} else if (primitive.mode == TINYGLTF_MODE_POINTS) {
mode = GL_POINTS;
} else if (primitive.mode == TINYGLTF_MODE_LINE) {
mode = GL_LINES;
} else if (primitive.mode == TINYGLTF_MODE_LINE_LOOP) {
mode = GL_LINE_LOOP;
} else {
assert(0);
}
glDrawElements(mode, indexAccessor.count, indexAccessor.componentType,
BUFFER_OFFSET(indexAccessor.byteOffset));
CheckErrors("draw elements");
{
std::map<std::string, std::string>::const_iterator it(
primitive.attributes.begin());
std::map<std::string, std::string>::const_iterator itEnd(
primitive.attributes.end());
for (; it != itEnd; it++) {
if ((it->first.compare("POSITION") == 0) ||
(it->first.compare("NORMAL") == 0) ||
(it->first.compare("TEXCOORD_0") == 0)) {
if (gGLProgramState.attribs[it->first] >= 0) {
glDisableVertexAttribArray(gGLProgramState.attribs[it->first]);
}
}
}
}
if (gGLProgramState.attribs["POSITION"] >= 0) {
glDisableVertexAttribArray(gGLProgramState.attribs["POSITION"]);
}
}
@ -666,6 +614,7 @@ void DrawScene(tinygltf::Scene &scene) {
for (; it != itEnd; it++) {
DrawMesh(scene, it->second);
DrawCurves(scene, it->second);
}
}

7
examples/glview/shader.frag
View File

@ -1,4 +1,5 @@
uniform sampler2D diffuseTex;
uniform int uIsCurve;
varying vec3 normal;
varying vec2 texcoord;
@ -7,5 +8,9 @@ void main(void)
{
//gl_FragColor = vec4(0.5 * normalize(normal) + 0.5, 1.0);
//gl_FragColor = vec4(texcoord, 0.0, 1.0);
gl_FragColor = texture2D(diffuseTex, texcoord);
if (uIsCurve > 0) {
gl_FragColor = texture2D(diffuseTex, texcoord);
} else {
gl_FragColor = vec4(0.5, 0.6, 0.7, 1.0);
}
}