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add a texture that updates every frame #4

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merged 4 commits into from
Mar 26, 2022
Merged

add a texture that updates every frame #4

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f1737b0
fill rectangle with a random texture
Sid-Bhatia-0 Mar 26, 2022
5fe82c6
make the rectangle conver the entire window
Sid-Bhatia-0 Mar 26, 2022
2fa0955
create different randomly colored blocks each frame
Sid-Bhatia-0 Mar 26, 2022
7b5ca58
replace glTexImage2D with glTexSubImage2D in render loop
Sid-Bhatia-0 Mar 26, 2022
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47 changes: 41 additions & 6 deletions example.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -32,10 +32,14 @@ MGL.glViewport(0, 0, width_image, height_image)
vertex_shader_source =
"#version 330 core
layout (location = 0) in vec3 aPos;
layout (location = 1) in vec2 aTexCoord;

out vec2 TexCoord;

void main()
{
gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);
TexCoord = vec2(aTexCoord.x, aTexCoord.y);
}"
vertex_shader = MGL.glCreateShader(MGL.GL_VERTEX_SHADER)
MGL.glShaderSource(vertex_shader, 1, Ptr{MGL.GLchar}[pointer(vertex_shader_source)], C_NULL)
Expand All @@ -49,9 +53,13 @@ fragment_shader_source =
"#version 330 core
out vec4 FragColor;

in vec2 TexCoord;

uniform sampler2D texture1;

void main()
{
FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);
FragColor = texture(texture1, TexCoord);
}"
fragment_shader = MGL.glCreateShader(MGL.GL_FRAGMENT_SHADER)
MGL.glShaderSource(fragment_shader, 1, Ptr{MGL.GLchar}[pointer(fragment_shader_source)], C_NULL)
Expand All @@ -73,10 +81,10 @@ MGL.glDeleteShader(vertex_shader)
MGL.glDeleteShader(fragment_shader)

vertices = MGL.GLfloat[
0.5f0, 0.5f0, 0.0f0, # top right
0.5f0, -0.5f0, 0.0f0, # bottom right
-0.5f0, -0.5f0, 0.0f0, # bottom left
-0.5f0, 0.5f0, 0.0f0 # top left
1.0f0, 1.0f0, 0.0f0, 1.0f0, 1.0f0, # top right
1.0f0, -1.0f0, 0.0f0, 1.0f0, 0.0f0, # bottom right
-1.0f0, -1.0f0, 0.0f0, 0.0f0, 0.0f0, # bottom left
-1.0f0, 1.0f0, 0.0f0, 0.0f0, 1.0f0, # top left
]
indices = MGL.GLuint[
0, 1, 3, # first Triangle
Expand All @@ -103,20 +111,47 @@ MGL.glBufferData(MGL.GL_ARRAY_BUFFER, sizeof(vertices), vertices, MGL.GL_STATIC_
MGL.glBindBuffer(MGL.GL_ELEMENT_ARRAY_BUFFER, EBO_ref[])
MGL.glBufferData(MGL.GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, MGL.GL_STATIC_DRAW)

MGL.glVertexAttribPointer(0, 3, MGL.GL_FLOAT, MGL.GL_FALSE, 3 * sizeof(MGL.GLfloat), Ptr{Cvoid}(0))
MGL.glVertexAttribPointer(0, 3, MGL.GL_FLOAT, MGL.GL_FALSE, 5 * sizeof(MGL.GLfloat), Ptr{Cvoid}(0))
MGL.glEnableVertexAttribArray(0)

MGL.glVertexAttribPointer(1, 2, MGL.GL_FLOAT, MGL.GL_FALSE, 5 * sizeof(MGL.GLfloat), Ptr{Cvoid}(3 * sizeof(MGL.GLfloat)))
MGL.glEnableVertexAttribArray(1)

MGL.glBindBuffer(MGL.GL_ARRAY_BUFFER, 0)

MGL.glBindVertexArray(0)

texture_ref = Ref{MGL.GLuint}(0)
MGL.glGenTextures(1, texture_ref)
@show texture_ref[]
MGL.glActiveTexture(MGL.GL_TEXTURE0)
MGL.glBindTexture(MGL.GL_TEXTURE_2D, texture_ref[])

MGL.glTexParameteri(MGL.GL_TEXTURE_2D, MGL.GL_TEXTURE_WRAP_S, MGL.GL_REPEAT)
MGL.glTexParameteri(MGL.GL_TEXTURE_2D, MGL.GL_TEXTURE_WRAP_T, MGL.GL_REPEAT)

MGL.glTexParameteri(MGL.GL_TEXTURE_2D, MGL.GL_TEXTURE_MIN_FILTER, MGL.GL_NEAREST)
MGL.glTexParameteri(MGL.GL_TEXTURE_2D, MGL.GL_TEXTURE_MAG_FILTER, MGL.GL_NEAREST)

width_texture = 10
height_texture = 10
channels_texture = 3
data = rand(MGL.GLchar, width_texture * height_texture * channels_texture)
MGL.glTexImage2D(MGL.GL_TEXTURE_2D, 0, MGL.GL_RGB, width_texture, height_texture, 0, MGL.GL_RGB, MGL.GL_UNSIGNED_BYTE, data)

while !GLFW.WindowShouldClose(window)
process_input(window)

MGL.glClearColor(0.5f0, 0.5f0, 0.5f0, 1.0f0)
MGL.glClear(MGL.GL_COLOR_BUFFER_BIT)

MGL.glActiveTexture(MGL.GL_TEXTURE0)
MGL.glBindTexture(MGL.GL_TEXTURE_2D, texture_ref[])
data = rand(MGL.GLchar, width_texture * height_texture * channels_texture)
MGL.glTexSubImage2D(MGL.GL_TEXTURE_2D, 0, MGL.GLint(0), MGL.GLint(0), MGL.GLsizei(width_texture), MGL.GLsizei(height_texture), MGL.GL_RGB, MGL.GL_UNSIGNED_BYTE, data)

MGL.glUseProgram(shader_program)

MGL.glBindVertexArray(VAO_ref[])
MGL.glDrawElements(MGL.GL_TRIANGLES, 6, MGL.GL_UNSIGNED_INT, Ptr{Cvoid}(0))

Expand Down